We're all crazy in some respect, I think... ;-)

However, I did know of a guy named "Crazy Bob" once in Toronto. He was a huge guy, bald with tattoos and a beard, he looked like a classic biker, and he WAS dangerous. Most people tended to avoid Crazy Bob. I'm not sure if he had any friends, but if he did they would also be people you would definitely tend to avoid if you had any sense at all.

For home defence against Crazy Bob, I would recommend the most extreme means possible...that is, guns, baseball bats, a really mean and large dog, a small tactical nuclear weapon, that sort of thing... ;-)