The shooter’s pistol had failed to go into battery and the shooter had aggressively hit the back of the slide with his left palm in an attempt to clear the malfunction. As he did this his left fingers went forward over the top of the slide just as the round detonated in the open ejection port. Fragments of brass severely cut his left index and middle fingers. After examining the shooters injured left-hand, a doctor at the scene determined that he was not seriously injured and only had some bloody but not serious cuts.

Source: Sensible Self Defense: Tap, Rack–or How Not to Blow Up Your Pistol

I have a Kahr and tried to simulate with a dummy round the events in that article. Oh yes it can happen if you are dumb enough. Go read and process.

TAP (the magazine) RACK (the side. More than once if needed.) Those two items in that order