Confession and Reenactment

A little girl being Girl: "Forgive me, Father, for I have sinned."

Priest: "What did you do, child?"

Girl: "I called a man a son of a bitch."

Priest: "Why did you call him a son of a bitch?"

Girl: "Because he touched my hand."

Priest: "Like this?" (as he touches her hand)

Girl: "Yes, Father."

Priest: "That's no reason to call a man a son of a bitch."

Girl: "Then he touched my breast."

Priest: "Like this?" (as he touched her breast)

Girl: "Yes, Father."

Priest: "That's no reason to call him a son of a bitch."

Girl: "Then he took off my clothes, Father."

Priest: "Like this?" (as he takes off her clothes)

Girl: "Yes, Father."

Priest: "That's no reason to call him a son of a bitch."

Girl: "Then he stuck his you know what into my you know where."

Priest: "Like this?" (as he stuck his you know what into her you know where)

Girl: "YES FATHER, YES FATHER, YES FATHER!!!"

Priest: (after a few minutes): "That's no reason to call him a son of a bitch."

Girl: "But, Father, he had AIDS!"

Priest: "THAT SON OF A BITCH!!!"

Explanation

Experiment

The joke plays on the priest's increasingly inappropriate behavior as he tries to understand the girl's experience. He keeps saying that each action isn't a reason to call someone a "son of a bitch" as he reenacts it himself, until he realizes the man had AIDS and immediately understands and responds with the same insult. It's funny because of the escalating absurdity and the shocking twist at the end.