Ninja Baseball Batman is by far the craziest game I have ever played.  The Japanese arcade game (known as Yakyuu Kakutou League-Man in its homeland) is the story of 4 baseball playing ninjas who go after an array of extremely wacky enemies to get back their beloved golden sports equipment.  Trust me the game is soooo much crazier than it sounds.  First you get attacked by giant anthropomorphic baseballs while touring a factory, then in the next level you take a cruise on a huge ship and battle electrical squid in battle armor!

The fun thing about this game is it's hard to tell who's a friend and who's an enemy so you just end up swinging bats at everything.  In one part of the game, a bunch of sunglasses-wearing baseball chicks (batgirls?!?) fall from the sky and start groveling on the floor and shooting energy out of themselves (I think from their breasts, but it all happened too fast to really tell) into your enemies.

The title in Japanese literally translates as "Baseball Hand-to-Hand Fighting League-Man". 

If you ever find this game in an arcade do yourself a favor and play it! This game will convince anyone that drugs are very, very bad for you.