Dumb things that you did.......because you didn't know any better.

At 17, I was working in a garage and had to go pump gas whenever the air bell rang. One hot day a 4 door light blue Dart with a 318, driven by an old lady asked me to Fill it up and check all the fluids, (that is what Full Service stations did in the late 70s).
After washing the windshield with a squeegee, I popped the hood, checked the oil, ran the engine for the auto trans dipstick, asked her to shut off the engine, went to pop the brake master cylinder cover, I guess she was ON the brake cause the fluid splashed all over the left side engine, I watched as the fluid smoked on the exhaust manifold and WHOOSH, went on fire! As the flames grew, I covered the cylinder and quickly grabbed the squeegee and started slinging the water onto the flames, enough to cool the fire and it went out.
My boss came over and surveyed the damage, only 1 minor disfigured spark plug wire. The funny thing was that the lady was oblivious, she just sat there and watched us hoovering around. Feeling awkward I said to her, "that will be $7.00 please and don't let anyone tell you that brake fluid doesn't burn".
My boss laughed later saying that it looked like I was blessing the car, running around slinging the water across the engine. Good times! LOL