10 Friends Moments That Were Totally Unscripted

10. "You Have To Stop The Q-Tip When There's Resistance"

Matthew Perry is responsible for a large number of Friends' improvised one-liners, but there's no better (or funnier) example of his quick wit than this pithy clapback in the season two premiere, "The One with Ross's New Girlfriend."

When Joey (Matt LeBlanc) fails to carry out some basic maths related to his age, a frustrated Chandler (Perry) admonishes him, "You have to stop the Q-tip when there's resistance."

It's an hilarious and unforgettable line, and yet one that incredibly wasn't in the script at all. Chandler was supposed to simply sneer at Joey and walk off, but Perry ad-libbed the line on the spot and dug up prime comic gold in the process.

Perry also declared in a recent interview that it's his favourite one-liner of the entire show, and considering the euphoric reaction it received, his pride is most certainly well-earned.