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1.
The retort to any person's lame excuse of "I know what you are, but what am I?"
Can be easily out-dissed by the secondary retort, "Takes one to no one."
Person 1: I guess you're a garbage man.
Person 2: I know what you are, but what am I?
Person 1: A garbage man.
Person 2: I know what you are, but what am I?
Person 1: A garbage man.
Person 2: Takes one to know one.
Bystander: Ooo, well-played, sir.
by fraces November 05, 2013