Quote from Rachel in The One with All the Thanksgivings
Monica: Listen, if you and Chip do it tonight, promise me you'll tell me everything. Rachel: Oh, totally, totally. You know, it's not that big a deal. We already kind of did it once. Monica: I know, but this time you're going to definitely know whether or not you did it. Rachel: I know. And Chip promised that this time it'd last at least for an entire song.