I too could add:
Stood on stone countertop to hang fixture, end up on floor with said stone countertop.
I could go on, and on... Over fifeteen years worth.
On crew ^%&*up's:
No concept of level, square or straight.
Dropping light fixtures, cracks large picture window in process.
Drill through finished floors.
Lost neutrals setting computers a blazin'!
Service side short, knocks out whole neighbor hood.
And thats just one guy.... (No longer employed)