Well Caleb over a Gun Nuts had an encounter with the knife wielding criminal kind. His method of self defense was quite good in that there was the use of a projectile weapon that persuaded the criminal to stop. The projectile weapon in this case was coffee followed by a Beretta aimed at the would be mugger now a coffee soaked running man.
This happened in broad daylight in a parking lot which goes to show bad guys can appear anywhere at any time. If you carry always carry (unless you legally can’t or will get fired for doing it).