a few years back i had a friend who has some left over mortars 4' round ones, we set up a pipe, and lit it off, it went like 200 feet straight up, and fell back to earth, with the fuse still burning, we could see it lol when it was 20 feet from the ground it went off, BOOM!!!!, ITS 3 AM MIND YOU LOL this lady pops her head out the window next door and starts yelling, and my drunken friend goes, sorry mam, i farted. cops were there 10 minutes later and the party was over, good times man.