Quote from Barney in 46 Minutes
Barney: I'll admit it. I can't lead this group. We need Marshall and Lily. Robin: But they're gone, aren't they? I mean, it'll go from seeing them a couple times a week, to a couple times a month, and then it'll just be holiday parties. Barney: Then the years pass, and you find out Marshall's dead, and you're there for Lily emotionally at first, but then it becomes sexual, and you feel guilty, but maybe that guilt just makes it dirtier and better... Ted: No, I won't let that happen. Especially that last part.