Drano Bomb

Take the Works toilett bowl cleaner, or Drano, and pour it into a plastic bottle. Size doesn't matter, because it still is the same loudness. Then take tons of tin foil, put it in, and put the lid on tight. Shake up really well before this. It takes like 5 min to go off. The smaller your tin foil peices and the more you, the faster it will happen.