So a man is in a monastery...

and he hears a strange noise coming from a door. So he asks one of the
monks what the noise is. The monk says, "Well I can't tell you because
you're not a monk." So the man asks if he can become a monk. The other
monk says he can and says that to find out what the noise is, he has
to go through the door.

So the man walks over to the door, but it's locked, so he goes back
and gets the key and goes through the door, but there's another door
behind it that's also locked, so he goes back through the first door
and gets the key for the second door and goes through the first door,
but then he realizes he's forgotten the key for the first door, so he
goes back and gets the key for the first door, and then he goes
through the first door, and then he goes through the second door, and
then there's another door behind the second door that's also locked,
so he goes back through the second door, back through the first door,
and gets the key for the third door, but then he realizes he's
forgotten the key for the first door, so he goes back and gets the key
for the first door, and then he goes through the first door, but then
he realizes he's forgotten the key for the second door, so he goes
back through the first door and gets the key for the second door and
goes back through the first door, and the he opens the second door and
realizes he's forgotten the key for the third door, so he goes back
through the second door, back through the first door, and gets the key
for the third door and goes back through the first door, back through
the second door, and through the third door and sees a lake that he
can't swim across, so he goes back through the third door, back
through the second door, back through the first door, and asks one of
the monks if there's any way to cross the lake, so the monk gives him
a scuba tank, but then he realizes that he's forgotten the key for the
first door, so he goes back and gets the key for the first door, and
then he goes through the first door and realizes he's forgotten the
key for the second door, so he goes back through the first door and
gets the key for the second door and goes through the first door,
through the second door, and then he realizes he's forgotten the key
for the third door, so he goes back through the second door, back
through the first door, and gets the key for the third door and goes
back through the first door, back through the second door, back
through the third door, and realizes he's forgotten the scuba tank so
he goes back through the third door, back through the second door,
back through the first door, and gets the scuba tank and goes back
through the first door, back through the second door, back through the
third door, swims across the lake, and finds a fourth locked door, so
he swims back across the lake, goes back through the third door, back
through the second door, back through the first door, and gets the key
for the fourth door, but then he realizes he's forgotten the key for
the first door, so he goes back and gets the key for the first door,
and then he goes through the first door and realizes he's forgotten
the key for the second door, so he goes back through the first door
and gets the key for the second door and goes through the first door,
through the second door, and then he realizes he's forgotten the key
for the third door, so he goes back through the second door, back
through the first door, and gets the key for the third door and goes
back through the first door, back through the second door, back
through the third door, and realizes he's forgotten the scuba tank so
he goes back through the third door, back through the second door,
back through the first door, and gets the scuba tank and goes back
through the first door, back through the second door, back through the
third door, swims across the lake, opens the fourth door, and finds
himself in a massive desert, but he doesn't have any water, so he goes
back through the fourth door, swims back across the lake, goes back
through the third door, goes back through the second door, goes back
through the first door, gets the water, but then he realizes he's
forgotten the key for the first door, so he goes back and gets the key
for the first door, and then he goes through the first door and
realizes he's forgotten the key for the second door, so he goes back
through the first door and gets the key for the second door and goes
through the first door, through the second door, and then he realizes
he's forgotten the key for the third door, so he goes back through the
second door, back through the first door, and gets the key for the
third door and goes back through the first door, back through the
second door, back through the third door, and realizes he's forgotten
the scuba tank so he goes back through the third door, back through
the second door, back through the first door, and gets the scuba tank
and goes back through the first door, back through the second door,
back through the third door, swims across the lake, and realizes he's
forgotten the key for the fourth door, so he swims back across the
lake, goes back through the third door, back through the second door,
back through the first door, and gets the key for the fourth door and
goes back through the first door, goes back through the second door,
goes back through the third door, swims across the lake, goes back
through the fourth door, and treks for eight days and eight nights
across the desert and comes to a fifth door, but it's locked, so he
treks for eight days and eight nights back across the desert, goes
back through the fourth door, swims back across the lake, goes back
through the third door, goes back through the second door, goes back
through the first door, and gets the key for the fifth door, but then
he realizes he's forgotten the key for the first door, so he goes back
and gets the key for the first door, and then he goes through the
first door and realizes he's forgotten the key for the second door, so
he goes back through the first door and gets the key for the second
door and goes through the first door, through the second door, and
then he realizes he's forgotten the key for the third door, so he goes
back through the second door, back through the first door, and gets
the key for the third door and goes back through the first door, back
through the second door, back through the third door, and realizes
he's forgotten the scuba tank so he goes back through the third door,
back through the second door, back through the first door, and gets
the scuba tank and goes back through the first door, back through the
second door, back through the third door, swims across the lake, and
realizes he's forgotten the key for the fourth door, so he swims back
across the lake, goes back through the third door, back through the
second door, back through the first door, and gets the key for the
fourth door and goes back through the first door, goes back through
the second door, goes back through the third door, swims across the
lake, goes back through the fourth door, and treks for eight days and
eight nights across the desert and opens the fifth door and is faced
with an endless tundra, but he doesn't have a coat, so he goes back
through the fifth door and treks for eight days and eight nights
across the desert, goes back through the fourth door, swims back
across the lake, goes back through the third door, goes back through
the second door, goes back through the first door, gets his coat, but
then he realizes he's forgotten the key for the first door, so he goes
back and gets the key for the first door, and then he goes through the
first door and realizes he's forgotten the key for the second door, so
he goes back through the first door and gets the key for the second
door and goes through the first door, through the second door, and
then he realizes he's forgotten the key for the third door, so he goes
back through the second door, back through the first door, and gets
the key for the third door and goes back through the first door, back
through the second door, back through the third door, and realizes
he's forgotten the scuba tank so he goes back through the third door,
back through the second door, back through the first door, and gets
the scuba tank and goes back through the first door, back through the
second door, back through the third door, swims across the lake, and
realizes he's forgotten the key for the fourth door, so he swims back
across the lake, goes back through the third door, back through the
second door, back through the first door, and gets the key for the
fourth door and goes back through the first door, goes back through
the second door, goes back through the third door, swims across the
lake, goes back through the fourth door, and treks for eight days and
eight nights across the desert, goes back through the fifth door, and
treks for seven days and seven nights across the tundra, and finds a
sixth door, but it's locked, so he treks for seven days and seven
nights back across the tundra, goes back through the fifth door, treks
for eight days and eight nights back across the desert, goes back
through the fourth door, swims back across the lake, goes back through
the third door, goes back through the second door, goes back through
the first door and gets the key for the sixth door,

(continued in comments, almost breaking the character limit)