[flashback to Lily at the GNB office with Barney:]
Lily: Marshall forgot his pants, so I'm bringing him a new pair.
Barney: Huh. Marshall forgot his pants. It's a good thing that you came by because he has a really important meeting today, and it would be pretty embarrassing and not at all funny if he were to show up not wearing pants. So, I'll make sure he gets these.
Lily: Great. Thanks, Barney.
[present:]
Ted: And you didn't give him his pants.
Barney: Theodore Evelyn Mosby. Of course I gave him his pants. I gave Lily my word. My word is oak. Though I did make some alterations.