At a bar, the Sailors and Marines are arguing about who can drink the most.

The bartender says, "Can anyone drink 10 pints in 2 minutes?"
The place goes quiet until one sailor pipes up, "I'll bet I can."
Instead of running up to the bar, he runs out the door.
A few minutes later, he's back. "Line 'em up," he yells.
The bartender pours the pints and sure enough, the sailor downs them in 2 minutes.
Amongst the cheers and back-slapping, the bartender asks, "where'd ya go just now before the contest?"

The sailor looks up, bleary eyed, "I went to the bar across the street to see if I could do it!"