Other things that annoy me are certain things people say, such as
"There's always one" (It's normally me)
"You've got more on the floor than you have in your mouth" (OK I'm a messy eater; and no I haven't.)
"It's the exception that proves the rule". (No it isn't and it doesn't.)
"It would be cheap at the half the price". (Surely they mean twice the price.)