There's one fun fact. If anyone does not know, it turns out the Germans, the people, the red card is called "Arschkarte". (Literally: Ass card). And all because, once before, when everyone had black and white TVs, the judges put the red cards in the back pocket shorts and yellow in the chest. Viewers , see where the card get, could figure out what color it is (on the screen it was difficult to make out the color).
PS: Wikipedia describes this fact, but doubts its authenticity