To siguy and anyone else at risk:
If you have symptoms of head problems, FORGET what your mother will think/do, and Completely forget about your slings. I know it seems very obvious from an outsiders perspective, but with very strict or harsh parents, this may be something which could end up 'on the line'. I don't mean at all to discredit Siguy or his maturity or what not, so don't take any personal offense!
And about Dan's remark on covering your head and waiting to hear or feel the stone...... Really, wait..... and wait.... and wait. They can take a LONG time to come down, and it seems a LOT longer when your crouched down, fearing for your safety or that of a window, and you can't see what's going on around you. To see what I mean, find a long slingspot, and in complete darkness, just sling (forward) with a pretty good lob. Some of you may be shocked at how long it takes to hear the breaking branches echo back.
Siguy, EXCELLENT to hear that you probably didn't hurt yourself...... When was the most recent slinging accident with serious consequences in a 'develeoped' nation? I've never heard of one; the last thing we need is laws on slings.
P.S. Unsapien, they would of course be helmets made of primitive materials right?
.... The thought of someone slinging with a bicycle helmet on is kind of funny