Quote from Roz in The Three Faces of Frasier
Frasier: Let the moment build. Besides, Niles hasn't arrived yet. Martin: Oh, I'd be surprised if he came. He's terrified of this place. Frasier: Still? My God, it's been thirty years. Roz: What happened? Martin: Oh, Hester and I brought the boys here when they were kids and Niles was running around, he bumped into the desert trolley and Stefano got hot and yelled at him and Niles got terrified and he, well... Frasier: He vomited. Martin: Right. All over Stefano's shoes. Then he ran out, hid behind the car and he hasn't been back in here since. Roz: Poor little weenie.