1966 World Cup, England v Argentina. German referee Rudolf Kreitlein sent off Argentina's captain, Antonio Rattín. But they didn't share a language. Rattín refused to leave for about 7 to 10 minutes!
After the match, England's Jack Charlton found out from the newspapers that he and his brother Bobby had been booked. Nobody on the pitch could tell!
Ken Aston, an English referee in charge of the World Cup refs, was driving home. He stopped at traffic lights in London. Amber = careful. Red = stop. Everyone understands that, in any language.
Cards were first used at the 1970 World Cup in Mexico. Nobody got a red card that whole tournament! The first World Cup red card came in 1974 — for Chile's Carlos Caszely.
The traffic-light story is Aston's own. His wife Hilda is said to have cut the very first cards out of paper, to fit his shirt pocket.