Short version - There is a little known crosswalk near an extremely busy street where I live. I don't believe I have ever seen a soul use it and I've lived here a long time. There are four total lanes of traffic and I am in the right lane. 

To my left, extending about 10' behind me is empty space, with high speed traffic barreling down to pass me if we continue moving down the road. All of a sudden out of nowhere, a pedestrian dressed in all black frantically throws their hand out in front of my car. 

They are approximately 10' in front of me and I am moving about 40 mph. My first thought is FUCK... if I slow down for this dude and he jogs across the road he is going to get hit by the truck behind me.

Guy in black by this time has stepped into the road, frantically waving his hand at me in exaggerated gestures. I am slowed to about 20 and was going to try to drive by him, but he is already in the road, so I short stop it. 

The guy locks eyes with me and waves his hand about 15 more times just in front of my car. He doesn't notice truck zoom by at about 50 or the line of traffic now flowing around me because they think I am in an accident. 

He looks at the traffic stream, back at me. Flips me off and walks away. 

Yes. Totally, always obey traffic... but I wish I had video of this because he would have been smoked for sure.