We had a guy show up for qualification with his HK USP and hand it over to be inspected.
The R.O. dropped the slide and pulled the trigger.
Nothing.
Rack and pull. Nothing. Hmm.
He takes it in the Armory and disassembles it. Somehow, He had gotten a small piece of gravel down in the firing mechanism.
"When's the last time you fired this thing?" he asks the copper.
"Uh...last qualification."
6 months ago.
Apparently, he'd cleaned it at the range, somehow getting the gravel inside. Then without performing a function check, loaded up and started answering calls.