enough

Casey and Riley agreed to settle their dispute by a fight, and it was understood that whoever wanted to quit should say »Enough.« Casey got Riley down and was hammering him unmercifully when Riley called out several times, »Enough!«
As Casey paid no attention, but kept on administering punishment, a bystander said, »Why don't you let him up? Don't you hear him say that he's had enough?«
»I do,« says Casey, »but he's such a liar, you can't believe him.«