Quote from Marshall in Mary the Paralegal
Ted: Barney, I'm not bringing a date. Even if I wanted to, the thing's in two hours. Barney: So get an escort. Ted: By "escort," you mean prostitute? Barney: Why not? Ted: Because... gross? Barney: Oh, gross. What, you have some puritanical hang-up about prostitution? Dude, it's the world's oldest profession. Marshall: You really think that's true? Barney: Oh, yeah. I bet even Cro-Magnons used to give cave hookers, like, an extra fish for putting out. Marshall: Aha, so then the oldest profession would be fishermen. Kaboom! You've been lawyered.