It’s world cup time again...tears and joy, the world on its head. But anyone who overdoes it risks a very sticky end to the party.An insurance company has sponsored a study by a group of analysts of the particular dangers posed by the celebratory automobile parade. The crash test illustrates the dangers fans expose themselves to when they lean out of their car to wave flags. Even at low speed a sudden deceleration or small impact can lead to a dangerous slingshot effect.