In this instructable, you will learn how to make a Clothes Pin mine which is great for, pranks. It "blows up" with a small impact. It will scare the heck out of annoying roomates, or any other people you want to scare.
Now that your done, the fun can began. you need a somewhat hard surface to set it on and then find a way to tip it over when someone dosen't expect it. But, be careful, the pins can move pretty fast so don,t point it at someones face.