Ted: Number four. "Unless you want to see it 80 times a day, for the next month, never show Robin a YouTube clip of an animal playing a musical instrument."
[Barney is asleep]
Ted: Barney! Do you have a problem with this class?
Barney: Yeah, it's boring as hell and I'm not learning anything.
Ted: Uh, well, maybe the problem is your attitude. You're not listening to a word I say.
Barney: Uh-huh. Uh, can you hear this, Professor? [thumbs down] Or should I turn it up for you? [thumbs up].
Future Ted: [v.o.] It may not have been a thumbs-up, kids.