Okay, here's a serious one. In Israel, and I'm pretty sure in most other Middle Eastern countries, headlights are required at all hours during winter months. This is one of those common sense laws that I really wish certain other countries would adopt.

If somebody flashes their lights at you and it isn't summertime, they are not being antagonistic or trying to send you a coded message. They are trying to remind you that you are being a silly tourist and have forgotten to turn on the headlights, because you didn't bother to learn anything about the local laws. I get the distinct feeling this has happened to a couple of noders.