How I Met Your Mother Season 3 Episode 12: "No Tomorrow"
Ted and Barney hit the town to celebrate St. Patrick's Day where Ted seemingly is rewarded for every bad behavior. Meanwhile, Lily and Marshall discover their apartment has even more problems... the floor is slanted.
Barney: Open your brain tank bro, cuz here comes some premium 91 octane knowledge. There's three rules of cheating: 1. It's not cheating if you're not the one who's married. 2. It's not cheating if her name has two adjacent vowels. 3. And its not cheating if she's from a different area code. You're fine on all three counts. Ted: How do you know she's from a different area code? Barney: She's 516. She might dress like she's 718 and act like she's 212, but trust me she's 516. Oh, and her husband letting her out alone on St. Patty's Day? If that dude's not 973 I'm 307...Wyoming.