Paraprosdokian

Readers are enjoying the humour of words from the Internet -- I hope that you will also enjoy these examples: 

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• "If I am reading this graph correctly—I'd be very surprised." —Stephen Colbert
• "On his feet he wore…blisters." —Aristotle
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• "I don't belong to an organized political party. I'm a Democrat." —Will Rogers
• "On the other hand, you have different fingers." —Steven Wright
• "He was at his best when the going was good." —Alistair Cooke
• "Outside of a dog, a book is man’s best friend. Inside of a dog, it’s too dark to read." —Jim Brewer, sometimes attributed to Groucho Marx.

"Paraprosdokian" comes from the Greek "παρά", meaning "against" and "προσδοκία", meaning "expectation". The term "prosdokia" ("expectation") occurs with the preposition "para" in Greek rhetorical writers of the 1st century BCE and the 1st and 2nd centuries CE, with the meaning "contrary to expectation" or "unexpectedly."

Wikipedia