[flashback to Barney and Marshall at MacLaren's on the day Ted met Holli:]
Marshall: That was fun. We should tell him that it's us.
Barney: Yeah, we should. Or... We tell him our favorite color is red, and we think the cowboy look is very sexy.
Marshall: Yeah, that's better.
[in the apartment, Ted is wearing the cowboy boots and texts back:]
Ted: [texting] "I'm wearing them right now, and they do look sexy."
[back:]
Barney: He put on the boots!
Marshall: He totally put on the boots! That was awesome!