Marshall: Barney, I'm well aware that you've developed a resistance to all of my old tricks, which is why I sought out special training.
[flashback to Marshall going to a kung fu class]
Marshall: Hi. Hey, I'm sure you get this question all the time, but is there a special class where I just learn slapping?
Teacher: We teach kung fu here.
Marshall: Right. See, the thing is I don't need to learn anything about kicking, you know, because, uh... So yeah, I'm good there. What I really need to learn is slapping. I need someone to teach me how to slap my friend just, like, really hard... right in his stupid face. Can you teach me that?
Teacher: Kung fu is an ancient and honorable martial art. It must be learned with great devotion and respect.
Marshall: So where are we on this slapping thing? Yes, no, maybe...?
Teacher: Get out.
Boy: Psst. I know what you seek. You seek to learn the slap of a thousand exploding suns.
Marshall: Yes, that's totally a thing I've heard of. Can you teach me?
Boy: No, but I know who can.
Marshall: Can you take me to this great master? I have much gold.
Boy: It is not one great master you seek, but three. They will teach you the three mighty virtues of slapistry. Speed. Strength. And accuracy. Put these three virtues together, and only then will you have mastered
the slap of a million exploding suns.