The ghost: In a series with talking poop and religious figures as superheroes, no doubt some ghosts would pop up on this Comedy Central staple over the years. The most ghost-centric episode would no doubt be 2009's "Dead Celebrities," when the young Ike is haunted by the likes of Billy Mays, David Carradine and Farrah Fawcett, among many, many others. Boo who? Ike, Stan's little brother, becomes the target of Michael Jackson, who refuses to acknowledge that he is dead. Jackson takes over Ike's body. Until Jackson admits he is not a young child, dead celebrities are caught in a purgatory of sorts. Note: The image above is not from "Dead Celebrities."