Although this wasn’t the worst, it most certainly could have been, and always comes to mind when questions like this are brought up.
I was on a job site. A half dozen houses were being built simultaneously. I walked too close behind an excavator, which abruptly turned. I nearly got hit in the head by the back end of that thing - which is all ballast and has tremendous mass. I almost got myself sent to the emergency room, and it would have been 100% my fault.
At the moment, I was just glad that none of the guys on my crew saw me pull such a rookie move. I didn’t think about it seriously until I got home that day. That excavator would’ve shattered my cheap plastic construction helmet like it was an eggshell. I could have died.
It takes a while to learn, but now I’m glad I know where some of the weird, obscure items are that people rarely ask for. It’s nice not to have to scour the store thinking “I just KNOW I’ve seen it around here somewhere…”