Robin: God, I feel awful. Barney is going through something big, and I've been obsessing about one stupid final hookup to get him out of my system. He needs space and time to figure things out. And I have to give it to him.
[later, Barney opens his front door:]
Barney: Robin? What are you doing here?
Robin: It's okay if you don't know what you want in life.. As long as you know what you want tonight.
[Robin takes off her coat to reveal a skimpy outfit]
Barney: Well... I do know what I want.
Patrice: Hi, Robin!
Robin: Nobody asked you here, Patrice!