I confess - prior to joining the FF I never wore a hard hat when felling trees. Since reading some of the horror stories and recommendations here I now do. Today it paid off.
Decided to cut some of my dead and dying ash in the woods around my pasture and when I cut the 3rd one, about 14-15 inches butt log, I notched and bore cut it as I find ash is bad to splinter and barber chair on me. It had a natural lean in the direction I wanted it to fall so no need for wedges or cables and snatch blocks like some of the others. I removed the saw and cut the holding wood and it fell right where I wanted it to go. I was sitting back fat, dumb, and happy feeling smug for such a great job then "whack". Out of nowhere (Probably from overhead if the truth be told) a 3' limb about 3/4" in diameter hit me right on the gourd and left shoulder. Probably not big enough to have really done any serious damage but I assure you it hurt a lot less hitting my hard hat than my bare scalp.
Thanks for everyone's attention and emphasis on safety and keep up the good work. Its real easy to get hurt and it can happen quick.