Something I didn't see anybody mention. You know how we like to teach our children, and to do so means they need to be close by. Well, if you do have children that like to watch, or assist, make certain that you not just warn them of the dangers, but that you try to keep an eye on where they are. If that can't be done alone, maybe they shouldn't be in the immediate area, or ask your wife, girlfriend, significant other to come help watch. Keep in mind their age and attention span, young children have a very short attention span, and will become lost in their own world while you're busy working on the car. That means they will soon forget all that you told them about such as, don't play inside the car while I'm under it, don't turn the steering wheel unless I tell you to, etc.
So with that in mind, keeping them busy handing you safe tools such as wrenches or hammers will keep them interested. Screwdrivers and hack saws are not the best things because of the danger of stabbing and or cutting injuries.
I'm sure many of you can think of other things that young children can find around the shop with which to produce self-inflicted injuries.
vettepilot