Marshall: Look, if you're really nervous, don't think of it as a slap, think of it as a high-five. For your stupid face. So anyway, I'm in the noodle house.
[flashback:]
Marshall: I'll admit, I didn't expect Red Bird, master of speed, to be a girl. You sure you really know how to...?
Robin: What is the sound of one hand slapping?
Marshall: I'm sorry, I don't understa... [slapped] Wait, how did you...? [slapped] Lucky shot, I wasn't ready... [slapped] You know, that tip isn't a full 20 percent... [slapped twice] Train me, Red Bird. Teach me speed.
Robin: No. I retired long ago.
Marshall: Retired? You're like 32.
Robin: I am 86 years old. But slapping is now a part of my past.
Marshall: Darn, I really wanted to slap Barney Stinson.
Robin: This is to slap Barney Stinson? Yeah, okay, I'll totally teach you.