paraprosdokian, paraprosdokia

(Greek: beyond expectations; surprise endings; a pun which is fun)

A phrase or sentence that takes readers to an unexpected conclusion: The paraprosdokian prepares people to anticipate something; however, it ends with a surprisingly different meaning and it is usually humorous.

Paraprosdokians are also defined as figures of speech in which the last part of the sentences or phrases are contrary to what is normally expected.

Etymology: from Greek para-, "beyond" and prosdokia, "expectation"; prosdokia consists of pro-, "before" + dokein. "to think, to imagine, to expect".

When two egotists meet, it's an I for an I.
Where there's a will, I want to be in it.
Women will never be equal to men until they can walk down the street with a bald head and a beer gut, and still think they are attractive.
Worry is like a rocking chair; it will give you something to do, but it won’t get you anywhere.
Yawn: an honest opinion openly expressed.
You can usually count on Americans to do the right thing; after they have tried everything else.
You don't need a parachute to skydive; you only need a parachute to skydive twice.
You feel stuck with your debt if you can't budge it.
You're never too old to learn something stupid.

There are no specific sources for these paraprosdokians because they come from so many places.