Here's an interesting piece of Bat-History! The photo up above features an original drawing of the World Heavy Weight Boxer Jack Dempsey fighting in the ring with the Dark Knight himself, Batman - illustrated and signed by Batman "Creator", Bob Kane!
The story goes that Bob Kane was enjoying a night out at Dempsey's Bar and drew this art piece for the famous Boxer, who was a fan of the Caped Crusader. A funny note, Kane may have been a little tipsy as he misspelled Dempsey's name on the title of the fight! The piece is signed by Bob Kane and inscribed to The Champ! The piece is framed at 24" X 33." This thing was sold on eBay recently and did pretty well.