I'm sure that it involves some major squick factors in some people, so you'll have to click past the cut marker.
'Course, as jadine said, this makes you want to click on it even more. Mua-haha. (wolfieboy is escorted off in a straitjacket)
The thought that I had was to tattoo a smiley face on the glans of my cock. Two black dots above the urethra for the eyes and a curved mouth underneath.
I think it would be absolutely delightful and very reflective of the idea that sex should be fun. I'm just not enough of a masochist to have it done.