Writer Patricia Lockwood has written a poem over at The Awl called "Rape Joke." It is not necessarily funny ha-ha, but it is very moving: "The rape joke is if you write a poem called Rape Joke, you’re asking for it to become the only thing people remember about you."
The rape joke is that you were to embarrassed to seek help after it happened because you liked the guy initially and you kind of wanted it to happen, but he turned into someone else — not someone else, his real self and someone you didn't like — and then you changed your mind. See? It's funny because you can't change your mind once you make it up.