In a hopefully more helpful serious vein, I always lay out my kit on the kitchen table the night before. Holsters, hat, ammo, boots, firearms, coat, belts etc with a double check on the calibers of my guns and the correct ammo and anything else that I'm going to show or shoot during our lunch break. I've caught myself a couple of times with the wrong ammunition for the revolver that I'd chosen. I do color code my ammo boxes as best I can. Its been a very very long time since I forgot my rifle ammo.