Why Fire Engines Are Red

..... or at least used to be

Well..............
2 plus 2 is 4 and 3 times 4 is 12.
There are 12 inches in a foot.
A foot is a ruler.
Queens are rulers.
The Queen Mary is a ship.
Ships sail on the sea.
There are fish in the sea.
The fish have fins.
The Fins fought the Russians.
Fire Engines are always rushin'...........
And that's why fire engines are red!