Even 20 years after its run ended,Friendsremains one of the most popular TV series of all time.

Yet,Friendsattracted someseriously famous people to appear as guest stars.

But among the many guest stars wasDie Hard’sBruce Willis.

The young cast of Friends sitting in front of the fountain for promotional photos

Image via NBC

Willis even won an Emmy for Outstanding Guest Actor in a Comedy Series for the role.

However, he didn’t get the role under normal circumstances.

Instead,Willis appeared onFriendsbecause helost a betwith Matthew Perry.

The cast sit at a coffee table and sofa in Monica’s apartment and Chandler has a bandage on his hand in Friends

Image via NBC

Willis became friends with one ofFriends’s stars, Matthew Perry, while they filmedThe Whole Nine Yardstogether.

Of course, what happened is obvious.

Willis honored the bet with his three-episodeFriendsarc, but he was right to be skeptical.

Paul (Bruce Willis) talking to himself in a mirror on Friends

Image via NBC

Surprising facts from the set of Friends.

Though glaring, this simply has to be ignored, butWillis' appearance creates another issue.

Still, the unusual situation and hilarious guest spot are well worth the minor continuity error.

Friends TV Series Poster

Ross Geller, Rachel Green, Monica Geller, Joey Tribbiani, Chandler Bing, and Phoebe Buffay are six twenty-somethings living in New York City. Over 10 years and seasons, these friends go through life lessons, family, love, drama, friendship, and comedy.

Friendsis available to stream on Max in the U.S.

Watch on Max

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Friends