haha my idea too! someone says "hey? you can play guitar? here play me somethin" i usually go with that. everyone always gets at least a chuckle out of it. when im done that, if they still nag me to play, ill go with "last kiss" by pearl jam. girls love it, guys usually get me to stop playing. therefore i dont have to play any more, and i get to talk to all the girls =D. but if the guys are too drunk or gay to make me stop, ill stick it out with time of your life, paint it black (acoustic has a pretty cool sound.. at least my acoustic) scar tissue, almost anything from great big sea, and classical gas always means im done. if im ever out playin and i get so far as to play classical gas, i demand a free drink from anyone whos pushin.
"ok, i have one song in my head left thats better than the rest of these songs put together, but im going to have to charge you a drink to play it"
"what? no, fine stop playing"
{plays the first little bit}
"hey why did you stop?"
"gunna pay up?"
"yea, here"
{plays classical gas}
classical gas. i love it to death!