Because they have eight wheels and four people in them, and eight and four makes twelve, and there are twelve inches in a foot, and a foot is in a ruler, and Queen Elizabeth was a ruler, and Queen Elizabeth was also a ship, and the ship sailed the seas, and there were fish in the seas, and fish have fins, and the Finns fought the Russians, and Russians are red, and Fire Trucks are always "Russian" around, and that's why Fire Trucks are red.
+95 I LIKE THAT DID YOU COME UP WITH THAT YOURSELF OR JUST FOUND IT BUT IT WAS VERY INFORMAL THANK YOU I THINK I FEEL SMARTER NOW
+83 FIRETRUCKS DONT STOP AND NEITHER WILL VLADIMIR PUTIN WHEN HE DECIDES TO DESTROY YOU FOR TALKING ABOUT RUSSIA WITHOUT CONSENT, PLEASE REFRAIN FROM RUSSIA BECAUSE I DONT WANT THEM TO DESTROY US ALL BECAUSE OF YOUR IMMATURE JOKE YOU RACIST BIGOT
