Whenever I handle my HK45, the first thing I do is run my finger along the round indicator, drop the mag, rack the slide, then point the gun at the ground at an angle, and use the decocking lever. I then run my finger along the round indicator again to see if it's jutting out and whether or not anything is potentially chambered.
That's my ritual, and everytime I handle the gun, I do this. It's now just become ingrained with my behaviors.
Glad to see you're okay - at least now you'll have an interesting story to tell. It's just so crucial to remember the 4 Rules no matter what you are doing or where you are!