I once came across a guy who had had a bike wreck in the road. He was lying there and a dude in a Jeep was stopped across the road, just staring at the guy. As soon as I stopped, he shrugged and took off. 

That said, that was daylight during working hours. At 3am I'm unlikely to stop for two dudes lying around the road either. I'll motor on by and then call the cops from a safe place.