Went to a thrift store last week near work and they often have old dev or technology books (I picked up a first edition K&R C book, once) and I found:

1) A book on the history of codes and ciphers throughout history.
2) Beyond good and evil by Nietzsche.
3) A modern publication of a 1673 Spanish demon summoning book (to go into a local town archive).
4) The technical information and construction manual for telegram systems from 1938.

I swear I was driving home thinking:

"Please don't crash, if CSI teams have to piece my identity together from these four personal items I dread to think what conclusions they're going to come to..."