Today the guys decided to play with the sparklers we bought for New Years. They took a case of sparklers and wrapped them with electrical and duct tape. You leave two sparklers sticking out like a wick.
After the sparklers are tapped together, light them and drop them down a 2" piece of pipe. The resulting explosion is awesome.
We took a 2" pipe 18" long and put a cap on the bottom. The guys made a sparkler charge and set it in an old camper. When the charge went off, it blew the glass out of the camper. The camper walls are pushed out and we have a hole in the floor and the ceiling. It was awesome. It dislodged the cabinets and collapsed the bathroom door.