25th Friends Anniversary: Back Up Your Friends Mastery With These Well-Hidden Facts
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.
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.