A hero is only as good as his villains, and thankfully Batman has the absolute best selection of rogues of any DC hero. There's the egotistical Riddler, the tragic Two-Face, and of course the maniacal Joker, among others. These crazy Batman villains have helped cement the Dark Knight as a legend, and some of them have proven they're strong and complex enough to carry their own comic book series, too.
Below is a list of some of the worst things Batman villains have ever done. Some are grand, doomsday-esque scenarios, while others are more personal vendettas against people who messed with the wrong villains. Either way, all these villains are certifiably insane - and the psychotic things some of them have done definitely prove that fact.