A fast one
Changing the rules mid-game so you win and the other guy gets the short end of the stick.
He said we were playing poker, then he added a rule that I had to pay him if I folded.
She said we were splitting the bill, then she took the whole thing and said it was a 'tip.'
My buddy said we'd split the pizza, then he took the whole thing and said it was a 'pizza tax.'
xs