Film Canister rockets - baking soda and vinegar

Mix baking soda with just enough water to make a thick paste. Pack it into the inside of the lid of a film canister. Fill the canister halfway with vinegar. Snap the lid on. Turn it over and step back. Note: in the video, the set-up is done by 30 seconds... the rockets don't launch until 1:18 if you want to skip ahead to the excitement.