Pretty attentive of Mr Watson too, keeping track of his ammo.
Shit Happens! A few weeks ago I threw on one of my vests (not a hunting vest), a little later I was digging through the pockets looking for my lighter and found 2 live twelve gauge shells and one round for my 45 long Colt.
Why they were there, I HAVE NO IDEA, perhaps I was wearing that vest when I was unloading and cleaning.