I know it sounds weird and stupid, but it happens. My utility freaked out and wrote a really crazy "no weapons policy" (I work for the uber-PC City Of Seattle) after an electrical worker left his 1911 in Condition One in a stall, and it was found by a hoplophobe. This same guy also lost said 1911 on Aurora Ave. N. while riding his Harley, resulting in sparks and a very scuffed 1911.
Another guy I know managed to leave a Charter Arms Bulldog .44 in a department store changing room.
Some people just need lanyards -- or a few more brain cells....
“The police of a State should never be stronger or better armed than the citizenry. An armed citizenry, willing to fight is the foundation of civil freedom.” Heinlein