Sometimes when I'm with friends and we find ourselves in a bookstore we do the "Worst Book Cover Challenge" where we go into a section that usually has bad covers (fantasy or romance) and on the count of 3 grab a book at random from the shelf and see which one is the most awful. And there are a lot of awful books I've seen. Plenty of cheap vampire and zombie books now, but science fiction - for all that I love it - has some pretty bad ones, too.
Oh, and as I side note, yesterday I found 10 used DW books from the 70s at my bookstore. Seems they'd been in the backroom forever and no one wanted to put them on the shelves because they thought no one would buy them. D: When I have more money I'm going back to grab some.