What Isn't on the Internet?

An Anonymous Coward writes: "Every modern geek knows that one can find practically everything on the Internet these days. In fact, I just realized today that I have *never* not found anything I've searched for, barring things that can't for some reason be released in such an environment, or things that just don't exist, even off the 'net. I think it would be interesting to find out what people have searched for that isn't out there ... have any of you ever looked but come up dry?"