You're downtown. It's night time, around 7:30. There are people around, but it's sparce. You are walking toward your parking garage when you notice across the street a homeless guy screaming and yelling. He's violently kicking over newspaper machines and trash cans while screaming obscenities. He's throwing punches in the air. He suddenly darts across traffic yelling "fuck you" to the cars which almost hit him. Now he's running right toward you at full speed, and you are the only person on the sidewalk. You have about 6 seconds until he gets to you. He's looking at you in the eye and he's obviously batshit insane and violent. He's also a pretty big guy and in decent shape. What do you???