The answered-with-a-question
"Why do you always answer a question with a question?" — "Why shouldn't I answer a question with a question?"
"Why do you always answer a question with a question?" — "Why shouldn't I answer a question with a question?"
Classic form: "Start worrying. Details to follow."
Two diners: "The food here is terrible." — "Yes, and such small portions."
The form: a man bargains with God — over minyans, over Sodom, over one more chance — citing precedent like a lawyer with a strong case.
Groucho Marx's canonical wire: "I don't want to belong to any club that would accept me as one of its members."
The classic forms and folk jokes are folklore — retold for generations with no author to credit, which is why variants abound. Attributed lines (Groucho's club wire) are credited to their tellers. Where a joke is strongly associated with one comedian's routine, we say so; passing off a comic's bit as folklore is the collector's version of a counterfeit.
They are genuine in-tradition forms — affectionate exasperation from inside the family — and their edges have been argued about within the tradition itself for decades, which is part of their story. We present the affectionate register and note the argument; the sour outsider versions that use the form as a costume are exactly what the house rule exists to exclude.