My Dad was in the Plumbers and Steamfitters and welded. It took me a long time to figure out why he took firecrackers to work occasionally. Apparently, it was a long standing prank to put firecrackers under the work area of the apprentices. When the cutting sparks hit the crackers and went off, the entertainment began.
Reminds me of the time I had a little fun at the campfire. Let just say firecrackers can be concealed very well inside of a marshmallow on the end of a stick. Nobody notices the tip of the fuse sticking out, and then..