I fly private planes as a hobby and during my training that practice was kinda grilled in to me. After flying for a bit, you end up realizing how easy it is to

I fly private planes as a hobby and during my training that practice was kinda grilled in to me. After flying for a bit, you end up realizing how easy it is to "see" something incorrectly, or to skip an item, etc. Even when there's no one else in the plane with me, I say things out let, touch nobs to confirm their position even though I checked it earlier and didn't touch the nob at all at any portion in the flight. (Good) Pilot training will make you aware of just how much trouble your mind can get you into.