Robin Williams Had The Best Cameo In "Friends" History
The late actor crashed Central Perk in Season 3, and it's the best.
In Season 3 of Friends, Robin Williams and Billy Crystal made amazing guest appearances.

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They play best friends who crash the orange couch in Central Perk.

NBC / Via youtube.com
Robin Williams' character is going through a hard time because he thinks his wife is cheating on him.
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And the six friends can't help but listen to the ridiculous conversation.
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Williams is absolutely hilarious, and he totally brings his A game.
NBC / Via reginaphilange.tumblr.com