The "head" or the "mirror image"?
I was able to order the "head" one after they had been out of print for a while. Apparently either they found another stash of them or had them reprinted. Realy like that one - it's on my wall at work. One of my favorites!
The one that gets the most stares, tho, is the one I have from 2005 (also at work) with the brain escaping the head, the guy driving the brain with the "hitchhiker", and the psycho flower.