When we're watching Friends, they're Monica, Chandler, Ross, Rachel, Joey and Phoebe.

QUIZ: WHICH CHARACTER FROM FRIENDS ARE YOU MOST LIKE?

But it turns out that Courteney Cox, Matthew Perry, David Schwimmer, Jennifer Aniston, Matt Le Blanc and Lisa Kudrow were just as funny - and just as close - as their on-screen counterparts when the cameras stopped rolling.

READ: WHAT WATCHING FRIENDS TAUGHT US ABOUT FRIENDSHIP

To celebrate the 20th anniversary of everyone's favourite sitcom, we've dug out Conan O'Brien's extra-special sit down with the Friends gang - during which they revealed their absolute favourite bloopers and outtakes.

READ: TOP 33 LIFE LESSONS WE LEARNED WATCHING FRIENDS

And, trust us, it's a must-watch for any die-hard fans of the show:

SEE: THE FRIENDS REUNION 2014 POSTER THAT WASN'T SUPPOSED TO BE SEEN

Watching this, it seems as if Matthew Perry is just as cheeky as Chandler Bing!

Which was your favourite Friends blooper? Let us know via the Comments Box below now.