Absent Minded
I worked in a camera store. My co-worker worked in our lab that printed pictures and processed film. We had a machine that developed film automatically. All we had to do was load it and change the chemicals every once in a while.
Since film is light sensitive, if it’s exposed to light before it goes through the chemicals, the film is ruined, and there won’t be any pictures to make from it. My co-worker was working on his computer when the film machine started beeping.
He went over to the machine and opened it up while the film was running through it, exposing the film. Our head lab guy started yelling at him, “Close it, you’re exposing film”! Not only that, but the machine had a screen that said what the problem was and when film was being processed.
I had no idea why he felt the need to open it. The guy barely lasted a month.