Ike, Mike, and Mustard

It was the early 60s and three brothers, Ike, Mike, and Mustard were taking a bus from Nashville to Memphis. Somewhere along the way Mustard finds he needs to crap. He nudges Ike. "Hey man, what do I do, I really gotta crap." Ike replies, "Fuck if I know. Why don't you go in your sock?" Mustard was against this, he didn't want to ruin a sock. Well, the miles dragged on, and he needed to go worse than ever. Eventually, he gives up, and craps in the sock. Now he has a sock full of shit and no idea what to do with it. He asks Ike, "Hey man, now that I've crapped in it, what do I do with it?" Ike, disgusted, responds with, "throw it out the window!" Mustard throws the sock out the window. Almost immediately, they hear sirens. The bus pulls over, and a highway patrolman climbs in, livid. He asks, "who threw that sock?" Mike, who had been silent through this whole thing respond with, "It was Mustard!." The highway patrolman bellows, "Bullshit that was mustard! It was pure shit!."