I thought I had a scan of this one, but I don't 
(and I can't dig it out at the moment).  But it's 
the greatest "hidden image" I've ever seen.

One of my cheapie Tenchi cels once came with a 
matching sketch of Tenchi's head (the hair layer 
didn't have a sketch).  On the top of his head, 
the animator had sketched a little love note, with 
two Japanese names and a heart in between them.  I 
couldn't resist---I pulled the stuck cel layers 
apart and....

LOL!  Yup.  The sketch had been copied exactly, so 
that underneath Tenchi's hair, tatooed on his 
head, is a love note from the animator.

AWWWWWWW.

JP