Anti-Joke

A joke or riddle-joke that starts like a standard joke or riddle-joke, but then turns out not to be a joke at all. The surprise element thus becoming the joke.
A standard joke turned into Anti-Joke:
A man walks into a bar. His alcohol problem is destroying his family.

Riddle joke turned into Anti-Joke:
Q: How many blondes does it take to screw in a lightbulb?
A: It shouldn't take more than one person to do this task, regardless of hair color.

Knock Knock joke turned into Anti-Joke
"Knock knock"
"Who's there?"
"It's the police. There has been an accident. Your wife is in intensive care"
by dkgemini May 25, 2006
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