'The Three Days Rule' - Season 4, Episode 21
When Ted violates the "three day rule" by texting a girl he just met, so Barney and Marshall get back at him by impersonating her.
Air Date: April 27th 2009.
Barney: If there's one thing we know about Ted, it's that he likes a nice body. This body would rock his world!
Marshall: Ted and I have a history. I know what he likes. There are things I could do to him that blow his mind ... why do we keep trying to have sex with Ted?
Barney: I don't know, it's weird.
Ted: The three days rule is insane. Who even came up with it?
Marshall: Barney, don't do this. Not with Jesus.
Barney: Look at me! Now look at you. A still-in-the-closet 80-year-old wouldn't be into that mess.
Marshall: Here's the thing, Barney. I'm snuggly. You're not. Who wouldn't want to snuggle up next to this business on a Sunday morning, wrapped in a comforter, and it's raining outside and there's muffins warming in the oven - I'm cuddly, bitch, deal with it!
Barney: Nice! Girls whose names end in LY are always dirty: Holly, Kelly, Karly ... Lily.
Marshall: Hey! Oh, yeah, I know it's true.