Paraprosdokian - A paraprosdokian is a figure of speech in which the latter part of a sentence, phrase, or larger discourse is surprising or unexpected in a way that causes the reader or listener to reframe or reinterpret the first part.
I'll start out with a few. Feel free to add your own.
1. Where there's a will, I want to be in it.
2. The last thing I want to do is hurt you, but it's still on my list.
3. Since light travels faster than sound, some people appear bright until you hear them speak.
4. If I agreed with you, we'd both be wrong.
5. We never really grow up; we only learn how to act in public.