Found out in the dark that a plug wire had gotten knocked off a magneto by pushing down on top of it with an oil-soaked hand.
Welded a wrench/electrocuted myself by tightening the battery cable and grounding out the wrench to the radiator support.
The worst one though ruined a car. Had a 4 door malibu with the rear out to do a gear swap. Had the control arms off so I could box them in. Well, in a rush and tired (about 3 am) I had forgotten to replace the nuts on the front lower control arm mounts. Went in the street the next afternoon to "test" the 3.73's, control arms pulled out, driveshaft goes through the floor pans, control arms hit ground, rest of car leaps over rear end, rear end and tires end up underneath the trunk.
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