Never assume. Verify!
I used to work in luxury hotels. Big ones. Everyone was trained that if you tell a guest their request will be taken care of it is now your responsibility to make sure it is. Just don’t call maintenance or housekeeping expecting it’s done.
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Same thing with Alec Baldwin firing that gun without double-checking it first.
I was personally humiliated many years ago when I was a rookie C.O. in NY State's Auburn Prison. I was responsible for counting a company of inmates in a cell block. We were supposed to count them on the way down the gallery, and again on the way back. I came up with what I thought was the right count. I went downstairs to the block officer's desk, and noticed his count for my gallery was one inmate short, and so copied his number off his total count slip onto mine. I ended up screwing up the count, because one of the inmates on my gallery was at work in the mess hall, and his absence hadn't been reported by the mess hall officer to the block officer yet. My count had been right after all, but I doubted myself, and used the block officer's count instead. The count ended up being delayed, which cut into the time officers had to eat their supper before they ran the inmates to the mess hall for the evening meal. I had to go up front to the Watch Commander, and explain myself. It was something I never wanted to experience again, and so I always verified not only my count, but every report and document I was responsible for submitting the remaining years of my career.