Friend of mine (he's
Southern) says 'That'll be do.' You
know, as in:
Waiter: Will that be all, sir?
Friend: No, no, that'll be do.
First time I heard him say it I nearly fell down laughing. 'Course, it might've been an accident, but he won't tell.
I don't know why it's so funny to me. It just sounds like a mixture of 'that'll do it' and 'that'll be it'.