It's not supposed to make sense. 1

Theater 1

A-kun: "It's joke, you're supposed to laugh."
B-san: "If it was a joke, why wasn't it funny?"

A-kun: "Because it's not supposed to be funny!"
B-san: "Then what's the point of telling a joke?"

A-kun: "Not all jokes that are supposed to be funny really are, right?"
B-san: "Right."

A-kun: "Then if the joke isn't supposed to be funny in the first place, and if people don't laugh, it succeeds, and if they do laugh, even better! I call it the no-fail joke!"
B-san: "Something has failed, all right."

Theater 2

A-kun: "Why is paper square?"
B-san: "It's not. It's a rectangle."

A-kun: "Let's assume you're right."
B-san: "I am."

A-kun: "Why does it form a rectangle when folded?
B-san: "It's a rectangle to begin with!"

A-kun: "The square."
B-san: "It's a rectangle."

A-kun: "Oh, that it is. Thank you!"
B-san: "What just happened?"