He claims
that even he was not sufficiently deviant to suggest the eye sockets. Partly because you'd have to remove part of the body to allow access to the socket, which is cheating - you might as well start cutting holes in people or undoing their belly buttons.

However, elbows, backs of knees, gaps between fingers and toes and armpits have, I think been considered. Though he never confirmed that officially.

Edit @TWW: And some people can have an "outy" belly button.
(LongJohnBaldry, Thu 7 Aug 2008, 14:36, Reply)