I may have screwed up ....more than once

Eh, it could have been worse.:D
One of our local Mopar group got everything ready to fire up with a newly installed mechanical oil pressure gauge and didn’t realize he kinked the line and cracked it.
On fire up it sprayed oil all over his drivers side fender inside and out, as well as soaking his work bench and the window above it before he noticed and shut it down.
At least it just made a mess!
On one 440 build I broke in, I used a big oil pressure test gauge connected with a rubber hose, and hung it on the DS windshield wiper. As the run-in went on, I didn't realize the hose had enough slack to slide down slowly and come to rest on the hot exhaust header...burning a very small hole in the hose. Well, oil was misting out the hole onto the pipes at 70psi and, before I knew it, poof! The driver side of the engine bay was on fire, as well as the concrete garage floor under the car (it was half in/half out of the garage). I got it put out pretty quick so luckily the only damage was some melted wiring and a lot of nasty soot on the block, fenderwell, and firewall...but it could have been a lot worse. Wife will never let me live that one down...