My teacher for Materials told us about how his friends made a pipe bomb back in high school long time ago. They told him to check out what he had done, since he was known for doing things with explosives. When he went to his friends garage he found a big pipe that had been packed with a few boxes of gunpowder. He is an explosives nut, so he crimped the ends of the pipe for them and attached a fuse. It was so heavy it took two people to carry it out into the woods. They found an old cast-iron stove and one of his friends put it in there, but the idiot lit it without saying anything. After he told my teacher, how long do you think the fuse will last? My teacher started running as fast as he could. After they realized he was coming back they started running as well. The blast was so big that it launched the cast iron stove into the air and took 4 seconds to land. It also cut down a huge oak tree that it was next to, which landed on two of his friends who were hiding behind it and shot shrapnel all over the place.
A few days later some kids in school heard about this and tried to make one themselves. The only problem was when they tried to crimp the ends they did not do it the same way, and they set off some powder between the tube as they were pinching the ends. It caused the entire thing to blow up in their garage and killed them all.