Quote from Barney in Double Date
Marshall: Married! Barney: What is wrong with you? You're just looking. It's like fantasizing about other women. It's harmless. Wait. Don't tell me you don't fantasize about other women. Marshall: I do! It's just not that easy. Barney: False! I once fantasized about that silhouette chick you see on a truck's mudflaps. Took me less than a mile.