Russian Fire Engines
"Fire engines are red because they have two firemen. Two firemen have four feet. Three feet from four feet leaves one foot. One foot is a ruler. Queen Mary was a ruler. Queen Mary ruled the seven seas. The seven seas have fish. Fish have fins. The Finns were conquered by the Russians. Russians are red. Fire engines are always rushin'. And that's why fire engines are red."
Yes, some of the references are a little dated, but I think the point is clear.