I remember when there were cereal box prizes that you loaded with baking soda and put in water... included a submarine, scuba divers and PT Boats (because of JFK). http://cgi.ebay.com/1950s-KELLOGGS-BAKING-POWDER-PT-BOAT-CEREAL-PREMIUM_W0QQitemZ370073126785QQihZ024QQcategoryZ19080QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Hope the car runs better than the boat did.