Well, I have TWO submissions, and really need to win 'cause I got a 22 that needs parts! Both happened back in the 90s with the same company, on the same job, so it couldn't be my fault.
We were doing long hauls using old Cat 637s with no retarders or brakes. It was near the end of the phase for a residential tract, so all the finish grading was done to the streets and house pads. I had a full load coming down a long grade where I had to make a right at a T intersection. The speed was really building up so I was trying to drag the can but it had no effect. I don't know if it was the hard, wet, clay street or funny hydraulics but there was NO slowing and a hard right coming up fast. So I thought I'd just go straight, burn off some speed, turn around and come back. No problem. Just then the foreman's truck pulls up to the T. OK, still no prob 'cause I'm going straight. HA! HE thinks I'm gonna go to my right, so he turns to his right and stops!! OK now what? I'm going way too fast to turn right, and there is a truck parked where I was gonna go straight. So I split the difference. Up the side yard slope of the corner house pad I went, almost 200,000 pounds airborne, landing just in time for the 4 to 5 foot vertical drop into a cul-de-sac, and head-on into the vertical across the street, then a wave a dirt thru the window to the back of my head. As the dust settled I shook myself off, backed the 637 up and motored past the foreman, shaking his head in disbelief.
And later-
They had me wheel-rolling a slope, at the top of a bigger slope, with an ancient Cat 824- no brakes, steering barely worked, cables held onto dead batteries with vise-grips. So with no brakes, after reversing to the bottom of the compaction area I had to slam it back into forward and hope the engine didn't stall. Well one time it did. So off I go backwards down the hill, with no brakes, no hydraulics (steering), and no way to restart. It didn't look like that bad of a ride, it eventually flattened out. Until it started to turn. Toward a power pole. But not one of those nice wooden ones. No, a 100+ foot tall steel Edison transmission tower with what, like 12,000 Kv? Turns out a 824 counterweight is just the right height to shear one of those towers cleanly off it's concrete pier, plunging a large portion of Orange County into darkness.
A few months later I got a bill from Edison for $35,000.
Respectfully submitted,