OK, so I've maid a cuppl of misteaks:
Ordered 50,000ft of #8 Green instead of 500ft.
Switchgear with mirror image layouts, or NEMA 1 instead of 3R (More than once).
Failed to specify Aluminum conductor on an 4500ft order of 750MCM, after telling the supplier less than a month earlier to always send us copper unless instructed otherwise.
Sent guys to the wrong side of an empty multi-tenant building and had them "demo/make safe for remodel" about 1500 sq ft of office area.
Had the wrong colt (horse) gelded (castrated)
Drove into a utility pole while staring nervously into the rearwiew mirror at the Sheriff's car that was behind me.
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...just to name a couple...S