A couple of years ago, I bought my car from a nice man who said he needed to get something more practical — he told me he was going to buy a BMW so he could drive his mother around, since she was moving here from the mainland.
Anyway, I few months after I got my car, I was driving on the highway and someone got in the lane next to me and matched my speed so he could see in through my passenger window. He honked, so I looked over, and then he grinned and waved. I was too surprised to do anything other than give him a shocked look and then look away. He stuck around for a couple more seconds, then got off the freeway.
Of course, a few minutes later it dawned on me that the man in the car had been driving a BMW and was probably the man who sold me my car! I felt awful because he was probably excited to see his old car on the road and just wanted to say hi. I’m sorry, Mr. Former-Owner-Of-My-Car!