Odd things that can go wrong 5...

With your 1911.

What happens:
You keep hitting the slide release, letting it slam, into battery, with no magazine or ammo to slow down the slide.  Over and over.  Just messing with your empty gun, or once or twice a range trip over many range trips. 

What this causes:
Well the hammer and sear bounce against each other when you do.  Preening and knocking chunks off the sear face or hammer hooks.  NOW your 1911 may go full auto.  Bad bad .