Over the years, the Bat symbol has gone through a multitude of design changes, from the classic haloed bat through to the flaming street art that was an odd inclusion in The Dark Knight Rises, but I can't say I've ever seen anything quite like this skewed take on the iconic logo, which appears to have been drawn on by either a child or someone using their wrong hand. Look at the steady-hand work on the left hand-side, and how symmetrical the symbol is in general... Might fine work.
18. The Joker?
Take away the green hair and the purple haze around the edge, and it would be quite difficult to recognise this little beauty as Batman's greatest nemesis. Slightly rough-looking transvestite with a penchant for too much lipstick, yes... but Joker, no.