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Bruce Willis had to cameo on the show because he lost a bet
Oh, and he did it for free! After starring in The Whole Nine Yards together, Willis and Matthew Perry grew close. The two had a wager going that the film would be number-one at the box office on its opening weekend. Perry had faith, Willis wasn’t so sure. The film ended up being number-one and, as a result of losing that bet, Willis had to guest star on the sitcom for free! Well, sort of. Any earnings he would have made were actually donated to charity. He’s one of our favorite guest stars so we’re pretty happy he lost that bet!