The Grim Adventures Of Billy and Mandy Season 2 Episode 3 - Mandy, the Merciless / Creating Chaos / The Really Odd Couple >Billy accidentally sets off a powerful stink bomb in Mandy's house and, while the house is being disinfected and fumigated, Mandy's family goes to live with Billy's. Billy and Mandy have a dispute over how to split Billy's room, prompting Grim to intervene. Mandy takes over the entire room, and imprisons Billy inside a brick wall with his mouth gagged by a dark red handkerchief..