The One With All The Facts About ‘Friends’ That Will Even Surprise The People Who’ve Binged Every Episode
Bruce Willis Guest Starred On The Show For Free Because He Lost A Bet

Photo credit: @CBR / Twitter
While filming The Whole Nine Yards, Matthew Perry made a bet with Bruce Willis that their film would be number one on opening weekend, and Willis disagreed. Wilis was already set to guest star on Friends, but after losing the bet, he had to donate his earnings for the guest stint to charity.
Thanks to Lisa Kudrow, there’s another NBC sitcom that’s technically a part of the Friends universe.