Melanie Lynskey stars as Rose on Two and a Half Men.  Rose is Charlie's neighbor and after a one time fling becomes his full fledged stalker.

Rose, despite her craziness, is actually quite intelligent and went to both Princeton and Stanford.  Rose moved away to London but still makes the occasional appearance.

Rose Quotes

...We're both like two lonely socks that want desperately to keep someone's feet warm, but we don't match up with any other socks. So all we can hope for is to be a dust mitten or a hand puppet

Rose

Charlie: I thought we agreed we were just friends.
Rose: We are. We're friends who slept together once, and then one friend never called the other friend, but luckily the other friend forgave him.
Charlie: Where are you going?
Rose: To make my friend a grilled cheese sandwhich.
Charlie: Rose, Rose, I don't want a grilled cheese sandwhich.
Rose: Would you prefer a quesadilla?
Charlie: That sounds nice

Two and a Half Men Quotes

Charlie: For every gorgeous woman out there's a guy tired of banging her.
Alan: But that guy is never me.

Charlie: You're like an Alzheimer's patient in a whorehouse.
Alan: What do you mean?
Charlie: You're constantly surprised that you're getting screwed, and you don't want to pay for it