I previously asked you to imagine you were in a certain situation. Many of you correctly guessed that it really happened. However, I wasn't the one in the truck. Here's the rest of the story.
I was driving my little Mazda 323 on a six-lane highway late one night. There were signs overhead pointing to each lane and saying where it went. I needed to get into the left lane to go where I was going, so I did so. Soon, I saw lights in my rear-view. I looked at them for a long enough to realize they were approaching fairly quickly. I decided to move to the right so the guy wouldn't have to slow down or pass me on the left. At that instant, I saw a black object in the middle of my lane, dead ahead. It was at least 12 to 14 inches in diameter, and you know a Mazda 323 can't even come close to clearing that. It was too close to swerve, so I slammed on the brakes. As I squealed down the road toward the inevitable collision with the object, I was suddenly able to see what it was. It was a goddamned balloon! I ran over it and no doubt popped it in doing so. I heard the truck's brakes squeal also.
I moved right so the truck could pass. The truck moved with me, staying in my lane, and flashed his lights at me a few times. As we approached the split, he went a different way than I and honked at me as we went different directions.
There's no way he could have seen that balloon, so he probably thought I slammed on my brakes because I thought he was too close even though he wasn't.
I figure the driver of the truck flashed his or her lights at me to show me that he was miffed about me slamming on the brakes in front of him. I didn't blame the guy for getting ticked off, because he wasn't tailgating me. Even if he had been, I was in the left lane and had more than enough time to move right and let him by before my turn-off, so slamming on the brakes would have been a stupid, reckless way to seal with the situation. So I understood the other driver's anger, but had no way to explain what happened.