How to check one's moral compass:

So, when a nice young man approaches you and offers you an ex libris book (from the "right" high school library) on the history of gastronomy with the name of an infamous cannibal serial killer signed (twice) on the check-out card, do you:

a) Say, "Oh my...that is the most disturbing thing I have ever seen. Begone dark stain."

b) Say, "Oh my...that is the most disturbing thing I have ever seen. You should really take that to TBD, who would love to handle such things."

c) Say, "Oh my...that is the most disturbing thing I have ever seen. I would love to handle it...the crass factor is cool."

d) Say, "Oh my...that is the most disturbing thing I have ever seen. I would love to handle it and I know someone who will buy it tomorrow."

I find it interesting how something can be "exceptional" in very different ways. You can have something that is exceptionally beautiful (e.g. Paul Bonnet's spectacularly bound Faust). You can have something that is exceptionally significant (e.g. Metcalf's first sketches of Ethernet). You can have something exceptionally funny (e.g. a pristine copy of Crumb's, Zap 1). Or you can have something that is just exceptionally disturbing.