The One with the Blooper
Anyone who followed the entire ten seasons of the sitcom Friends, with its emotional rollercoaster, knows that the actors meshed so well that they effortlessly slipped into their roles from the beginning. This made it easy to ad-lib an extra line or two when a script was forgotten or when someone had something to say.

The hilarious line “This isn’t a marriage, it’s the world’s worst hangover” wasn’t penned by the show’s writers. Jennifer Aniston spontaneously came up with this line on the spot, and it seamlessly fit the scene, leading the directors to keep it. It undoubtedly garnered laughs from the audience, making it all work out for the best.