(Can you spot the spine? If not, just click on the image and see a bigger version on Flickr)
I used to have this very same volume (same edition, the Simon Necronomicon) but a friend (Sean) borrowed it in College and I never saw it again after that. I didn’t mind losing it too much, because it was basically a big goof.
To quote the Wikipedia entry:
The Necronomicon was first mentioned in Lovecraft’s 1923 short story “The Hound”, though hints of it (or similar books) appear as far back as “The Statement of Randolph Carter” (1919). In the stories, the book is dangerous to read because it is often harmful to the health and sanity of its readers. For this reason, libraries keep it under lock and key.
Capitalizing on the notoriety of the fictional tome, real-life publishers have printed many books entitled Necronomicon since Lovecraft’s death.
It was goofy fun when we were teenagers, although my friends have better stories about exploits involving the Necronomicon than I have.