Don't laugh too hard.
I HAVE run across several situations where some #$%%^$ idjit installed the wall switch or receptacle into the box with full length drywall screws. Crooked, of course. Completely stripping out the mounting threads in the wall box and buggering the mounting holes in the device mounting ears in the process. And making the switch or receptacle floppy from then on.
And making it so that a replacement switch or receptacle would never be able to be installed with the included CORRECT mounting screws that are ATTACHED to the new switch or receptacle. ARRRGH!!!
Had to look up and cite chapter and verse from the NEC on "workmanship" and "rated hardware" to 'management' to get the repair routed to the electrician to fix it. Along with other obvious installation fails, such as missing cover plates and exposed bare wires in the box with no cover plate. WTF!