Ok, here is one of the funniest things that was ever said during a game -
"I scream"
The character was played by a newbie (he was the friend and co-worker of one of the players). The character was a half-orc barbarian. The party was being hassled by a group of dopplegangers. One of them had set the party up bad, and at one point while in the guise of an 8 year old girl, the half-orc attempted (and failed) to break her neck (ooh, what a hoot that was).
Well, during a later encounter, three dopplegangers had assumed the form of the half-orc and proceeded to surround him:
Me: "You see three of you".
Player: "I scream".
The mental image of a 20 Str, tough-guy, half-orc Barbarian screaming like a little girl is just wrong.