Here's mine:
There are two chicks standing in a club near the dancefloor.
One fucking hot sexy chick and her ugly fat girlfriend.
So you walk up to them and start a conversation with the ugly chick.
So... uh... I was wondering... you know I don't want to be impolite but eh... would you like to dance?
This chick thinks whooo finally somebody who asks me to dance and says YES OFCOURSE!!
Good you say, then I can talk to your girl friend in the meantime!
(works like a charm)