I can pretty much guarantee that this is a topic that will have you scratching you head.
Trust me on this. All those rules we all live with, generally come about at the result of someone being injured, or worse yet, being killed. I know a lot of you are saying Use Common Sense, and you will be OK. While this is generally reasonable advice, there are always exceptions, which is what can get you if you dont follow the basics. So, rules are created to help protect you from the unknown conditions we are often eposed to, or are beyond our control.
Ask yourself what if???