Tam vividly illustrates why we gun nuts are so obsessive about verifying that guns are unloaded:

That's right, Arthur had loaded the PPK back up in his car, and then brought it back in to add to the trade, and not one person who handled it from the time I picked it up and put the trigger tag on it to the time the customer made the loud noise had bothered to inspect the chamber because, hey, we had already done that when he brought it in the first time, right?

When I run people through the basics of gun safety, I like to add Rule 6: "You are shadowed at all times by a quartet of elite ninjas whose only job is to load your gun while you aren't looking."