Friends: 10 Best Characters Who Appeared After Season One

Everyone who has siblings knows what it's like to both love and be frustrated with someone. Most people tend to get on well with their brothers and sisters, but things get a little tricky when they're as abrasive and rude as this.

The "other" Greene sister was introduced in season nine as she came to Monica's thanksgiving feast and managed to offend pretty much everyone at the table. She was rude about baby Emma, insulted Ross, and got annoyed when she found out she wouldn't get Emma if Ross/Rachel died.

Amy was a beautiful example of what Rachel could have been had she not made the choice to change her life. This meant she was a hilarious display of someone with no self-awareness and a great chance to see just how far Rachel had come.

Rachel's other sister Jill deserves mention here as well but wasn't quite as entertaining as this Greene girl. Sometimes, it's just fun to watch someone being mean for the sake of it.