There was the time when I was removing a 10,000 gallon gasoline storage tank. I was sitting on top of the tank connecting the cable and hook of the trackhoe to a hole in the tank. When the trackhoe operator started pulling on the tank the metal hook rubbed against the metal of the tank which inturn cause a spark to drop into the "empty" tank. Luckily for me there wasn't enough oxygen in the tank, just enough to cause a small flash fire and a slight bulge in the tank (mrsandman as an ex-fireman I'm sure you've heard the sound of explosive vapors igniting before).
I kind of felt like Slim Pickens from the movie "Dr. Strangelove" except I didn't have a cowboy hat.
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