The 'Friends' cast had a group huddle before every episode to wish each other luck.
The 'Seinfeld' set had a 'no hugging, no learning' policy to keep the show's tone consistent.
During 'The Office' filming, Steve Carell often improvised lines that made it into the final cut.
The 'Big Bang Theory' cast would play practical jokes on each other between takes to keep things fun.
On 'Parks and Recreation,' the cast and crew often broke character due to hilarious improvised moments.
From wardrobe malfunctions to unexpected guest appearances, sitcoms have a treasure trove of behind-the-scenes stories.