You may have seen/read/heard of it as the psychiatric hospital in Gotham City. It houses the criminally insane villains such as the Joker, the Riddler, Bane, Poison Ivy, and if you read the comics instead of watching 90's movies, then Two Face is also there.
Scarecrow uses his infamous fear gas on his criminal clients to make them criminally insane. Escapes happen more times than Gotham City care to discuss.
Basically its the nut house you never want to be near. So what better game for Rocksteady Studios to release than Batman: Arkham Asylum for PS3, Xbox 360 and PC? Instead of being based around the movies, this one is based around the DC comics.
How freaky is the Joker? Makes me never want to laugh again.
Can't wait to play this one.