We pilots all have our fears when it comes to flying. Luckily, they rarely keep us from enjoying our time aloft.
My aviation nightmare scenarios usually involve running out of fuel. I understand how ridiculous this might sound, because the problem is easy to avoid. I also know how easily distraction and complacency can lead to disaster where fuel is concerned. Sometimes we simply forget to keep track of how much we have on board and how quickly we are burning it.