Some freakie things jump to mind.
When he was unhappy with his defense, he grabbed one of his teammates -- Andreas Herzog, a more easy-going type of player -- and almost hurled him on the grass.
In Dortmund he stormed out of his goal and caught a ball to stop the counter-attack. His right leg was stretched out. If he had hit the attacker, a liver would had to be transplanted.
Another time against Dortmund, he wanted to get intimate with Heiko Herrlich, at least it looked like that.
But the weirdest occurence I recall is, when Bayern were trailing in Rostock by one, Kahn decided to do some offense. Ball came high in Kahn's direction, he accelerated, jumped and fisted the ball in, using both hands. He got his second booking for it. Man, he looked pissed that day
The Rostock incident has been the last serious one afaik. He is more self-controlled these days
edit: found some
pictures
or you can open following link and replace the number. I don't know where it ends
http://www.antibayern.de/images/kahn/kahn9.jpg