Most Friends fans know all 236 episodes off by heart, from 'The One Where Monica Gets a Roommate' to 'The One Where They Say Goodbye'.
And ask them to recall the most famous moments, and they'll probably tell you about when Monica and Chandler hook up, when Ross says Rachel at the alter, unagi or when Rachel gets off the plane.
But another unforgettable scene is the Pivot moment, which sees Ross, Chandler and Ross attempt to move a sofa up a flight of stairs.
It comes in episode 16 of season five in The One With the Cop, when Ross buys himself a new coach and enlists the help of his pals to get it up to his apartment as he didn't want to splash out on delivery.
As he tries to direct them up the turning staircase, he repeatedly shouts Pivot - to absolutely no success.
David Schwimmer, who plays Ross, has since said he's never laughed as much as he did when he filmed that scene, which is proven in the outtakes.
In a clip shared on social media, the three stars can be seen breaking down into fits of laughter as they try to film the scene.
While laughing, David can be seen mocking his "pivot" cries, which leaves Matthew Perry and Jennifer Aniston in stitches.
He then signals for the crew to cut the filming, while the live audience continue laughing at the hilarious moment.
Fans' obsession over the show means they've spotted several errors over the years, including a mistake in the episodes showing Monica and Chandler's wedding.
The two-parter from season 7 aired in 2001, offering emotional moments, brilliant gags and of course some very, very exciting baby news.
But the lead up to the wedding wasn't straight forward, and a row over a dress almost led to Chandler missing out on his dream wedding band.
He wanted the Swing Kings to entertain guests on their special day, but when Monica got into a row at the dress shop with another bride they faced a choice.
She booked the band for the day of their wedding, meaning they couldn't have them unless Monica gave up the dress.
After a lot of upset Monica finally decided to sacrifice her dream dress for her future husband, and the Swing Kings were all booked into perform.
So you can imagine everyone's surprise when on the big day the band who were playing weren't actually the Swing Kings.
After all that effort, the band that actually took to the stage were the Jungle Swings.
Who?
Well according to some very eagle-eyed fans, the band also played at Barry and Mindy's wedding back in season two.
So what happened to the Swing Kings? Does that mean Monica got the dress in the end?
Or it might might just be an error in the props department. WHO KNOWS.
