Quote from Phoebe in The One After the Superbowl (Part 2)
Chandler: I've met the perfect woman. We were sitting on her couch, fooling around and then she turns to me and says: "Did you ever want to do it in an elevator?" Monica: What did you say? Chandler: I believe my exact words were [indistinct speaking]. Chandler: I mean, I didn't know what to say. How do you know if you wanna do it on an elevator? Phoebe: Oh, you just know.