Manslaughter charges for improper towing equipment.

yes there is always a segment of the population that with make mistakes!
A truer statement was never uttered. That segment is 100% of the human race. Even if you never allow any one to talk to you while you are hooking up, even if you use a printed check list, even if you use reminder tags. All of these things are aids towards perfection, but the chance for error is a constant. Do not become complacent due to your years of experience or your inflated ego.