Barney: Watch your steps when you get up, kids, 'cause I am about to drop some knowledge. Relationships are like a freeway.
Marshall: Wait a minute, a month ago you told me relationships are like a traveling circus.
Barney: No, this is new. This trumps that. Freeways have exits. So do relationships. The first exit, my personal favorite, is six hours in. You meet, you talk, you have sex, you exit when she's in the shower.
Robin: So every girl you have sex with feels the immediate need to shower? Actually, yeah, I get that.
Barney: The next exits are four days, three weeks, seven months... That's when you guys are gonna break up, mark your calendars.
Barney: Then a year and a half, 18 years, and the last exit, death. Which, if you've been with the same woman for your entire life, it's like, "Are we there yet?"