Robin: You really are smitten.
Barney: No, I'm not. I'm Barney Stinson. I don't get smitten, I smite!
Robin: You are totally smitten, but you're scared of being in a relationship.
Barney: No, I'm not. I can't be anyone's boyfriend, Robin. If I got serious with Nora, it would be like if Mother Teresa focused all her attention on one really hot orphan. With great penis comes great responsibility.