Bag Bomb
We used to have BBQ's of a Monday eve at our place, generally a dozen or more of our late teen/early 20's chums would show up. The area was quite posh, but were quite not, so the neighbours weren't real fond of us to start with. We'd taken to making little rockets by filling plastic soft drink bottles with acetylene and dropping them cap end first down a drainpipe that had it's end stuck in the fire - a little "boom" and off it sailed!

Well, we thought, we can do better than this! I came up with the idea of filling a large plastic garbage bag/bin liner/"whatever the seppos call them" with acetylene and setting it off in the front yard. For a fuse we used a light fitting, inside the bag with the two poles wired together to make a spark when the power was switched on. We put the bag in the front yard, retreated to a (hopefully) safe distance and the call to power on the fuse was made.

¡BOOM! It was very fucking loud. Later, a friend lived a couple of blocks away told us her windows shook. So we waited for the police to arrive. They just drove straight to our place, didn't think of going anywhere else. I hid, Jef spun some story and they left with a "now don't do it again". Great fun :)
(Pleiades, Mon 30 Jan 2012, 7:43, Reply)