Robin: So Ted hasn't been texting Holli at all? He's been texting you two?
Barney: Look, we knew he'd try to call her before the three days, so I swiped his phone, and I changed her number to my work cell.
Marshall: We were just gonna bust on him for calling her too soon, but then he... started texting her.
[flashback to Barney and Marshall at MacLaren's on the night Ted met Holli:]
Barney: "Texty text"?!
Marshall: Oh, Ted. Oh, poor, sweet Ted. We should... We should tell him it's us.
Barney: Yeah. Or... we pretend we're Holli, and we're in the bath.
Marshall: Yeah, that's better.
[back in his apartment, Ted chortles]