What is Anti-joke?
1.
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"
See
2.
A Joke that's funny because it isn't. Dead baby jokes are so rude and politically uncorrect, they can only be funny, thus an Anti-Joke
How do you get a baby in a bowl?
A Blender.
How do you get it out?
Dorritos.