Top 10 Unexpected Celebrity Cameos in FRIENDS



Robin Williams and Billy Crystal
Season 3 “The One with the Ultimate Fighting Champion”

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Robin Williams and Billy Crystal appeared on the screen, interrupting the six friends, and insisting that the two guest stars would love their seats in Central Perk, because they’re that special. Robin Williams’ character suspects that his wife is having a romance with another guy, who turns out to be Billy Crystal’s character.