When I lived in berkeley, I noticed a number of "barking mad" characters.

One is "The Hate Man". He goes around running off a list of everything he hates, as if reciting a mantra, but he's basically harmless.

Another is a guy who opens the doors to various businesses, and gives a mighty "roooooooaaaaaaaaahrrrrrrrrrrr!" and scores of people roar back!

Now that I live in vegas, I'll see if I can spot such characters around here. I know there are some in every community. :)

T