Okay, what in your collection would you not wish on your worst enemy? You have to actually own the book.
For me it's a tossup between: Bears Dicover Fire and Revenge of the Fluffy Bunnies.
Hah, I rather enjoyed Bears Discover Fire, but then I read it in Best Sci-Fi Of The Year 8, so it could be a different version.
the worst book I own is "Fell Swoop" by Piers Anthony. He really does not like writing Xanth anymore, and you can tell.
It's 'Swell Foop', and I'll agree that that was not his best effort. I don't think it's that he doesn't like writing Xanth anymore, he's just burned out on it. A few years away from it would probably do the series some good.
Two worst books I own (or did own at some point or another):
2) Blue Mars, by Kim Stanley Robinson. The first two books in the series were a fun read about new rebellions and new political sytems---the last one was about 200-year-old people whining about dying of old age, with a completely cop-out ending.
I'll agree to that. Yet, every time I break out Red Mars, I have to read the other two.
I once had an English teacher tell the whole class to never read Walden if they could possibly avoid it, because it was just so damn boring.
The worst book that I own (that I've read, I own a lot of books that I haven't read yet) is House Of Stairs. I once saw a copy at a friends house, and the conversation went thus:
Me: Have you read that book yet?
Chris: That is the worst book I have ever read. Whatever you do, do not read it, it's terrible. It sucks, seriously.
Me: I was about to warn you of the same thing.
At least it was short.