From Mork to Madman: Robin Williams' Most Memorable TV Appearances

Check out some of Williams' wackiest, wittiest small-screen turns

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In 1997, Williams and longtime collaborator Billy Crystal made an off-the-cuff cameo on the popular must-see-TV sitcom, coinciding with their film Father's Day, which opened the day after the episode aired. Their roles as fighting friends Tomas and Tim were ad-libbed because they weren't included in the original script — the actors just-so-happened to be in the same building the day the episode was shot.

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