12. Dustin Diamond
Appeared on: Celebrity Fit Club, Season 5 (2007)
The artist formally known as Saved by the Bell's "Screech" was a smug, condescending, self-loathing jackass who fought with everyone on Celebrity Fit Club, including one of the judges, U.S. Marine Harvey Walden, who clearly wanted to kick his ass from the set's stage all the way back to Bayside High. Although most wouldn't consider earning top Google honors for the search term "Dustin Diamond Douchebag" a win, if you're the attention-whoring Dustin Diamond, that's pretty much mission accomplished.