The flour bomb Take a wet paper towel and pour a given amount of baking flour in the center. Then wrap it up and put on a rubber band to keep it together. When thrown it will fly well but when it hits, it covers the victim with the flower or causes a big puff of flour which will put the victim in terror since as far as they are concerned, some strange white powder is all over them. This is a cheap method of terror and for only the cost of a roll of paper towels and a bag of flour you and your friends can have loads of fun watching people flee in panic. All you need is a bunch of those little round smoke bombs and a wrist rocket or any sling-shot.
Rotten eggs Take some eggs and get a sharp needle and poke a small hole in the top of each one.
Then let them sit in a warm place for about a week. Then you've got a bunch of rotten eggs that will only smell when they hit. This works especially well with flower bombs since a gummy, glowing substance gets all over the victim. Fizzling panic Take a baggie of a water-baking soda solution and seal it. Then put it in a bigger plastic bag and fill it with vinegar and seal it.