On my very first visit to Buenos Aires I literally stumbled across this yellow traffic sign. I never saw a sign like this before so I could only wonder what it possibly means. You may laugh about me, but it's actually the truth. This traffic sign is anything but self-explanatory. The mysterious rhombus-shaped sign says watch out, but what for? Now I know it means "Escolares", but still, it looks like a business man with a briefcase to me rather than a school kid.
Did you ever stumble across any secretive signs?