"I put a cover back on a hand hole on a 480 v parking lot light one time on my own time...the screws were laying in the cover."
"...a control box dangling off the wall... I stopped and put in the proper size screws and mounted it back to the wall."
"The electricians forgot to nail up a box, so I snatch a hammer out of a toolbox, pound the nails into the stud, and walk away."
I can see it now... Two guys coming back from lunch, ready to continue work, when:
"Um, Sam, didn't we leave that open/off/hanging when we left???"