Jimmy Kimmel helped one of his writers pull a prank on his roommate. The writer, Jack Allison, decided it would be fun to prank his roommate Mitch, who fully believes in ghosts. Unfortunately for Mitch, Kimmel is a master of pulling pranks. Sometimes he even gets in people's heads by assuring them they're not being pranked. But in this case, Kimmel had a full production crew and cameras rolling in order to scare poor Mitch to death. Mitch's fear of ghosts ensured he never had a chance, and it also confirms that Jack is the meanest roommate on the history of the planet. Not as mean as this boyfriend who pulled a ghost prank on his girlfriend, but pretty close.

Sources: Jimmy Kimmel Live