Bruce Willis played Paul Stevens, the father of Ross's student girlfriend in three episodes of Friends. He fell for Rachel while trying to impress Ross and ended up in a dilemma. Willis didn't receive any payment for his guest appearance because he lost a bet to Matthew Perry, who co-starred with him in The Whole Nine Yards. Perry bet that their movie would be a box office hit, and if it was, Willis had to appear on Friends for free. After the movie topped the charts for three weeks, Willis kept his promise and donated his salary to charity. Today, Willis' little role on Friends is still beloved and remembered.