Barney: Well, obviously, I've been proven right, so in the interest of Robin's dignity, I won't show anymore. Plus, it's getting late. It's already slap o'clock.
[Barney slaps Marshall]
Robin: What the hell was that?
Barney: I slap bet Marshall that you did porn, so I win.
Robin: Porn? I wish it was porn, it would be less embarrassing.