Another one that's fun is when I'm the only car on the road, with nothing behind me as far as the eye can see. Yet from a side road, parking lot exit, driveway, etc, someone will pull out right in front of me, so close that it's dangerous, and then not make the slightest effort to speed up. When they could have just waited the 3-5 seconds it would have taken me to pass them, pull out safely, and then just be on their way.
One day an old early 80's Dodge Colt tried this stunt right in front of me. Literally ran a red light, without stopping, to make a right turn onto the road in front of me. Nothing behind me as far as the eye could see. I didn't bother to slow down. The driver probably wet his pants as he made a quick evasive maneuver off onto the grass.
Yeah, yeah, I know, he could have had a gun. But I had a Buick. A big 'un! And besides, for all he knew, I could've had a gun, too!
Oh, and on the safety perspective, yeah, I know what I did wasn't the safest thing in the world. But I was paying attention to my surroundings, and if that Colt hadn't gone off the road, I had time to react. There was nothing coming the other way, so I did have the option of going onto the other side of the road to pass him. If there had been traffic coming, I wouldn't have pulled this little scare tactic.