I think you missed a subtle joke there which further ties into the version of her presented there. If you look closely at the TV, the kid's favorite movie that he refers to the star of is obviously "Jaws", and he's watching the scene where one of the characters slides down the boat and is eaten by the shark. Apparently, he took that scene a bit more... sexually than it was intended. Just another reason the joke wouldn't work at all with the more standard version.