Friends: 10 Reasons Why Ross Is The Worst Person Ever

10. Making A Move On His Cousin

If you wanted this list to start slow and build up to Ross's worst moments, I'm sorry, but it would be better for everyone involved if this particular sequence is cast aside as quickly as possible.

During the show's seventh season, Ross and Monica (Courtney Cox) receive a passing visit from their cousin, Cassie (Denise Richards). Initially staying with Monica and Chandler (Matthew Perry) during her time in New York, Monica sends her to Ross's after Chandler finds it difficult to keep his eyes off her.

This is a poor enough development in an episode bursting with ill-advised character assassinations, but things reach a whole new level of wrong, unfunny and just plain awful when Ross himself realises he's attracted to his own cousin, and tries to kiss her. Instantly (obviously) rejected, he then decides to tell her he hasn't slept with anyone in a while, causing her to leave disgusted.

The whole thing is far, far too weird to be even remotely funny, and the episode acts as both a reminder that Ross is an awful, questionable person, and that the show was starting to lose its way.