There are so many thousands of great moments in Friends, we could understand if the cast had a hard time picking their favourite moment.
But for Lisa Kudrow, who played Phoebe Buffay, there's a clear winner (watch it above!).
It happens to be one of our all-time favourites, too - because it contains a blooper that never got edited out.
"When Ross was learning to play, wanted to play the bagpipes,” Kudrow explained to E! News.
He says, 'Sing along,' and Phoebe does. And he's playing Celebrate by Kool and the Gang. It's stupid and funny.”
Who can forget Phoebe's cries of 'EeeeEEEEEEEeee!' while the rest of the gang look on in horror - or in Jennifer Aniston's case, stifled laughter.
The cameras didn't stop rolling as the actress struggled to hide her real reaction to Kudrow's brilliant acting - you can actually see the moment she stops acting and can barely hide her reaction.
Hoping to play at his sister's wedding, Ross starts by warning his audience “Remember, I’m still learning”. A few moments of the loud Scottish instrument earns a resounding ‘No’ from the Monica and Chandler.
It would have been a 'yes' from us, Ross.