I read something this morning which reminded me of an "incident" a couple of years ago so I have dug up this old thread.
I had some speakers laying around that I wanted to put in the rear of an old Volvo sedan. They are the ones contained in a plastic speaker box so all I needed to do was drill a couple of holes in the rear parcel tray to stop them wacking me in the back of the head if I came to a sudden stop.
The problem was the drill would not fit given the angle of the back window. The solution was to use a right angle drill attachment that I had bought but never used before. I must say that the drill attachment it is not the best piece of engineering but then I guess you get what you pay for.
Anyway with the drill attachment grumbling away & me trying to put some sort of sideway but downward pressure in the drill, the bloody thing was taking ages. Arms starting to shake from some sort of energy debt/lactic acid thing going on. Wondering if the drill bit was blunt or whether it is just the funny angle everything is on or the junky right angle drill attachment.
Finally success! Shhhhhhhhhhh, I drilled into the f@%kin LPG tank!
I just about crapped myself. The tank was a full as a goog. Dropped the drill & took off. It took hours for the tank to empty.
Later inspection revealed that I had drilled through the sheet metal under the parcel tray (as intended), the metal bracket holding the LPG tank & the tank itself. I can think of at least 2 sources of ignition (drill motor & cutting of the steel).
Anyway still alive to bore people with this story.