Stupid and foolhardy

So you have just set off on the final leg home, it's the north of France so it's quite cold and trying to rain.
As you leave the hotel garage, you close your window and you hear a loud bang from the door.
Is it an attempted assassination?  No.
Has a large stone hit the door? No.
What should you not do? You should not try the window to see if something is broken inside and to see if you can open it, because if something has broken inside there is the strong possibility that you will not be able to shut it.
If you drive with your window open on a cold, rainy day you will get a pain in your ear, especially if you don't have warm outer garments, towels and a balaclava to hand. This will hurt. It will hurt a lot, and your car will slowly start to fill with water.
If, after a few miles, the pain becomes unbearable and you stop and try to push the window up with both hands, one on the outside and one on the inside, the window will shut. Your headache will go and all those around you will think that you are a hero. A brave but foolhardy hero. You can then continue your journey feeling smug and a lot dryer and warmer.
Here endeth the lesson.