“What is the most satisfying thing you have done to someone who blocked your driveway?”

I was living on a typical suburban street and always parked in my driveway, but parking was allowed along the curb. I had a friend who, when he visited, would always park blocking the driveway, even though there was always plenty of parking along the curb right next to my driveway. Note that he didn't pull into the driveway, he would park in the street, but in front of the driveway blocking it.

Any time I wanted to drive anywhere while he was there, I would have to ask him to move his car and wait for him to pull up along the curb. This was really annoying and I had asked him several times not to do it, but he always parked in front of the driveway.

Finally, one day I had to run to the store to get something and, of course, his car was blocking the driveway. He knew I was going to a convenience store and would be right back, but when I returned, rather than leave his car the ten feet he had to move it, he had moved his car back, blocking the driveway, That was it!

I had one of those tire valve caps with a valve stem wrench on the top. I slightly unscrewed all four valve stems so that I could barely hear a hissss, then I went into the house and handed him the valve stem wrench. I told him what I had done and that he’d better tighten those valves quickly, “…and while you’re at it move your car out of my driveway!”

At first he thought I was kidding, but he soon figured out that I wasn't kidding and he moved his car. He never blocked my driveway again when he came to visit.