While in France we have noticed the French can do some things pretty weirdly. For instance, our hotel room here in Tignes does not have a toaster and to flush the toilet you don't push the button down, you pull it up. They also like mayonnaise on potato chips (as in fries) but I think I read that came from Belgium.
And the traffic in Paris! It's insane! The road rules are more like guidelines really, that is if they exist. Lanes don't exist on many roads, except to separate oncoming traffic, so you might have a road that is six lanes wide and only has two three-car-wide lanes marked, one going one way and one going the other, and the cars all going in one direction just fit in and push in wherever they can until about the last fifteen metres before an intersection where the individual lanes will be marked. The round-about around the Arc de Triomphe is the worst. Apparently there is a car crash on that round-about every half hour. And they have ketchup and mayonnaise in little single-serve paper packets like you get sugar in cafes in Australia. These gauls are crazy!