Japanese license plates are over played? Well, we got sometimes very cool for you!
In Japan, when you need to drive a car that doesn't have a valid Shaken (car inspection) or is not registered, you can temporary use a special number plate called "Kari number" (仮ナンバー, "Kari" means temporary). This number plate can be requested at your local city hall, and used from 3 to 5 days. It is very cheap, you don't need many documents and it basically allows you to drive pretty much anything on the road. There are different format of Kari Number but the most common on features a diagonal red line, random numbers, and kanjis related to the prefecture and the city.