You don't look a gift horse in the mouth.
3-year-old: A cloud. Me: No, what do you imagine it could be 3-year-old: Rain.
He was looking for a porpoise. (thought this one up but I doubt I was the first one that did.)
Because Democrat left a bad taste in her mouth!
A piece of gum, you pervert!
At the filling station
Do you swear to pull the tooth, the whole tooth and nothing but the tooth