Best nonparticipatory cameo: Bono on "South Park" Chuck Jones and the "Looney Tunes" gang used to have celebrity cameos all the time in their cartoons yet never had to rely on the participation of Cagney, Bogart or Durante. But Hanna-Barbera changed all that with its extensive use of celebrity cameos in its "Scooby-Doo" mysteries of the 1970s. Luckily, Trey Parker and Matt Stone have taken things back a step by having scads of cameos by celebrities, without ever having to seek their participation. This was exemplified in 2007 when "Bono" appeared in an episode about competitive bowel movements. Fans got to see the U2 singer doing humiliating things while the show's creators never had to wonder about what the real-life Bono would think. The best of both worlds.
Peter Morrison / Associated Press
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