A strange thing happened on my way home from work. A truck drove by spraying some sort of white powder all over the place. This caused a traffic jam because drivers could not see through the dust cloud. At first I thought it was smoke, but it was definitely a powder, because some of it was left behind on the road surface. What was this stuff? Pixie dust? Pre-election mind control powder? Or did the road just need some talcum powder to prevent chafing?