'Big Days' - Season 6, Episode 1
When Ted and Barney argue about who has "dibs" on a hot girl, Ted realizes that she is there with Cindy, a girl he previously dated who is also the roommate of his future wife.
Air Date: September 20th 2010.
Lily: Marshall, woah! Wait. A big package just arrived.
Marshall: Yeah, it did.
Lily: No no, it's a real package from your dad.
Marshall: Okay, that's a little weird, but yeah, it is.
Lily: Barney, am I crazy? Marshall talks to his dad way too much.
Barney: You don't want my opinion on that.
Lily: Why not?
Barney: If I had my dad's number, I would never not be on the phone with him.
Lily: Wow, Barney. That was really...
Barney: Whoa, check out who just walked in! A hottie with a body! (Makes motorboat noises)
Ted: Barney just cut her some slack, she just went through a breakup.
Barney: With hygiene.