Yes FT, I made that observation many years ago and it has a general application which involves all matter in the universe. It is more than just gravity. Like things tend to flock together. There are always a few of us who like to buck that trend and I see you and I are together (!) on this one. I can't stand the bumper-huggers either. In addition to the annoyance, they create a traffic hazzard in the event that you have to take evasive action or if you should fail to remember they are there in your blind spot.