Quote from Barney in Do I Know You?
Lily: I don't believe it. I thought you called me over here to uncuff you from your sex swing again, but you're in love? That is so sweet!
Barney: It's not "sweet." It's like a disease. I slept with Robin one time and I caught feelings. I caught feelings bad. I used protection and everything.
Lily: Barney, you don't "catch" feelings, you just have them. And they're good.
Barney: They're terrible! I can't eat, I can't sleep. She's all I think about. I close my eyes, I see Robin. I, I hear a song; it reminds me of Robin.
Barney: I sleep with that chick, I'm thinking about Robin.