Larry Ellison, CEO of Oracle, has a somewhat quiet side to him: he is a board member of Apple Computer. With arch-enemies Oracle and Microsoft both having a huge hand in Apple, it seems as if it could shape up to be quite a battleground.
He is known for having a rough and even abusive personality, and is not highly regarded as a nice human being. There is a story that is told of his private airliner breaking curfew, and taking off and landing when it pleases, because it is "quieter than other planes". (This happened nine times). The city tried to take action outside of the legal system, so that he would no longer be (ab-) using San Jose airport. When the negotiations took too long, he turned around and sued the city of San Jose.
I am just glad I never have to deal with him. He is however a good friend of Steve Jobs. Perhaps the eccentric favor their own kind.