Quote from Niles in The Two Hundredth Episode
Tom: Please, if you don't mind, I was hoping you'd take a picture of Frasier and I. Frasier: Well, of course he doesn't mind. Actually, I've even brought along an eight by ten photo, personalized, of course. Tom: Oh, my. That's really- I don't know... Frasier: Yes, I thought you might like that. Tom: Yes. I'll have to do some rearranging, but don't worry, I'll find some room for it somewhere. [Tom opens some curtains to reveal a wall full of photos and newspaper clippings of Frasier] Niles: I, uh, thought that was a window. Tom: Yes, well, it was.