Several years ago, my wife and I were driving friends and their infant daughter from Jerusalem to Ben Gurion airport for their trip to USA for vacation. We were just about 5-miles from the airport, when they asked each other "Do you have the Passports?" NO! I then doubled back to Jerusalem, so they could retrive them from the dresser top. I really raced. They arrived quite late, but Israeli security did let them through.
On another occasion in Jordan, I arrived at the Treasury at Petra. Tried to take a picture. The camera battery was dead! (built-in special battery!). But there were several little Arab stands. Guess what? One of them had the exact battery for my Minolta. From then on, I always checked that I had extra batteries, film, etc. Also, my checklist includes all my meds.