Accidently ran a piece of 8-2 through an HVAC pleneum.
Still to this day the folks A/C wire runs right into and out of the center of the AC box:-)

Blew up a Square D metermain sitting on a t-pole:-)

Watched an HVAC guy pull out an A/C disconnect, put it back in and watched as two phases joined in eternal matremony.
Some idiot trim guy instead of hooking it and as LOAD LINE LINE LOAD he did LOAD LOAD LINE LINE.

Watched a service guy destroy a ladies meter-main combo panel, guess who paid for that.