I worked with some guys who were doing an oil change on a 1980s Nissan 300ZX. The order said to use a filter that didn't match the car, but it seemed to thread on correctly. Seconds after the engine was started, I saw the oil pressure gauge drop to zero, and I shut the car off to save it.
The car was lifted up a second time. When I checked the paperwork for that car, it mentioned "Pontiac LeMans" where it shouldn't have, and it called for the equivalent of an ACDelco PF47. I knew no Nissan Z 300ZX took that filter, and I sorted everything out. The oil pressure sender was destroyed when the filter blew off.
I knew of a guy who eventually caused an engine to run out of oil. It was discovered that he would finger tighten the oil drain plug, then return later to tighten it with a wrench... And in 2 cases it wasn't tightened. Luckily for the second customer, the bolt worked it's way out only partially, and there was a fresh oil stain under the car. I was able to tighten it in the parking lot, add oil, and sort out the situation.