A Koala walks into a bar...

Ouch. (had to)...

Ok, here's the real joke:

A Koala bear walks into a bar, sits down and orders a sandwich and the
bartender brings him a sandwich.

The Koala eats the sandwich and gets up, spins around, pulls a pistol
out of his pouch, shoots the piano player, an proceeds to walk out of
the bar.

The bartender, in shock, shouts to the Koala, "hey who do you think
you are, you ate my sandwich and shot my piano player, and just where
do you think your going!

The Koala replies, "Hey I'm a Koala. Look it up."

The frustrated bartender pulls out a dictionary from behind the bar
and looks up Koala: "n. a marsupial that eats shoots and leaves."