Lets see screw-up embarrassment -where do I start:
There was the time I nearly burned up my car because the main power lead at the alternator came loose/was loose and started functioning as an arc welder.
The above mentioned turn signal fiasco.
The front KO adaptor I forgot to torque the studs on, eventually came loose and wheel knocked going around a corner to remind me.
The LED taillight effort and failure which to this date remains unexplained.
Exhaust tic that drove me nuts for months until I discovered that when I slipped my headers on the partially threaded in lower bolts, a washer got trapped under the header flange, creating a nice exhaust leak.
The time I started my car on it's crank up dollies - while in gear. Still amazed how it just set there spinning the wheels on the dolly rollers.
I discovered this last weekend that I had my front coil over springs set about 1 inch difference in compressed height. I had to replace one for a bad adjuster when I first got my car running. Somehow I never managed to get around it adjusting it to match the other side. I thought I did. Been running around for 500 miles with one coil over up front doing probably 75% of the work.
Given a chance to review my prior threads I could probably expand the list considerably.
