I walk a 4 mile loop around Somerville almost daily and have encountered Mike frequently at Powderhouse. It usually alternates between us tossing each other the peace sign or him yelling obscenities at me. When he tries to talk with me, I take off my headphones and try to figure out what he is saying. I think he might be deaf, because of the way he talks. He is really hard to understand and he gets very agitated if you don't know what he is saying. He has never got physical with me, just yells obscenities. I think he is mostly harmless. I'd really like to learn more about him.