They showed on Discovery? Mona Lisa was actually a inverted self portrait of Da vinci. he made her or himself a women obviously.
Was quite convincing.
Here is a overlay of Da vinci and Mona Lisa. Its not hard to conceive considering he wrote backwards and so on.
http://2.bp.blogspot.com/_0yhVo-TfeQg/S39-lq6mAyI/AAAAAAAAEcs/Gci4ay2vUgU/s400/90.jpg
