You need to catch a taxi in the center of Tunis. Two cars are coming towards you: one with a red light and one with a green light. Which one do you stop?

Well, not the green one. Tunisians did it the other way around. Here, red means available. Even things that seem completely basic and obvious can differ in other countries.

I heard a theory that the light here is for the driver, not the passenger: if there's a passenger in the car, you can go, and they turn on the green light. So let the rest of the world think differently ¯\_(ツ)_/¯