I know most of you guys already know this, and maybe this has been posted before.
Do not use your finger to remove a nut that will not just fall out of the socket that is in your impact or air powered gun. I just saw a picture of a guy who did just that, the nut looked like 1/2 inch 13 threads per inch. When he stuck his finger into the nut to remove it from the impact gun he hit the trigger, the nut was run onto his finger quite a ways. You would have thought the gun would have in reverse. The picture was not pretty.