Quote from Phoebe in The One with the Mugging
Phoebe: Okay, I think we have a problem here. Monica: What? Phoebe: Well, back in my mugging days, you know, I worked St. Mark's Comics. Monica: Yeah? Phoebe: Well, a pipe was my weapon of choice and preteen, comic-book nerds were my meat. Monica: So? Phoebe: Well, there was this one kid who had a sticker on his backpack that said: - Monica: "Geology rocks!" Phoebe: "Geology rocks!" Monica: Oh, my God. Phoebe: I know. I mugged Ross!