I was picking up my mail from the Berkeley Main post office on Thursday evening. As I was coming out, I see a man in a knit cap and grey sweatshirt with navy blue shorts crossing the street coming toward me. I was thinking, ah a guy coming out from exercising at the Y, good for him. There is a YMCA across the street from the post office. I get in my car. The guy comes up close to my passenger window. I see him grabbing his shorts. I was thinking I must be seeing things. Then I see him grab his penis out of his shorts and masturbating. Iwas disgusted, infuriated, pist off. I pulled out of my space and drove around the block hoping to find a police officer close by, but didn't see one. When I came back around the post office, he was gone. I wanted to scream...if you can't control yourself, how about I help you control yourself with a pair of scissors! You pervert! Even though this happens all the time, I'm still in a state of shock when it happens. I forget to yell. I need to remember to yell out and make a scene. Leteveryone around me know these guys are perverts. They need help or get castrated!