Last night Johnny Knoxville and Britney Spears were both guests on Jimmy Kimmel Live, where they aired a skit of Britney performing one of the stunts from Jackass 3D, "The Poo Cocktail Extreme." It doesn't appear as though they used actual poop in the bungee porta potty, like they did with Steve-O in the movie, but she got wet with something, and then punched Knoxville in the balls.