Most useless book ever?

[Ravellion]

Magic of Faerun. Too much broken stuff in there for me to want to actually show it to my players.

Rav

 

[John Q. Mayhem]

Olsen's Standard Book of British Birds - Expurgated Version

I was going to buy that, but it was torn.

 

[Graybeard]

I used the Hero Builders Guide for awhile when I first bought it. However, I haven't used it in a few years so I guess it would qualify. I am pretty careful about buying books. Since I work in a bookstore, I get to borrow the books and look them over first before I decide to buy them.

On another note, I am looking for a copy of Deities and Demigods 3.0 if the price is right.