2. Bruce Willis played in the show for free because of losing a bet to Perry

It seems that Matthew Perry liked to set bets with his colleagues. While Perry and Willis were shooting The Whole Nine Yards, the two got into a debate whether the movie would reach the top position in the box office on its opening weekend.

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Bruce disagreed, while Perry believed it would certainly happen. When the movie appeared in February 2000, it became a number one film of the list. As a result of his lost bet, Willis had to donate his earnings for the guest stint to charity.