Those that don't want to be helped are unhelpable no matter how good your arguement or intentions.
Just because they have a pillow on their head does not mean they can not hear you talking to a shop ordering dinner. OUCH
Seriously lessened learned. Was fun for a start ended with a cracked woo hoo.
(was accident but still)..........3 months no xxxxxxxxxxxxxx due to a broken woo hooo..
Stand back when throwing aerosol cans onto fires.
Stand a LONG way back when it's a lighter fuel refill can (full)
Do it at night
"DO NOT !! "...wipe the rectum with a leaf of the stinging nettle, best just
to go daggy till one arrives at better pasture. 
You don't actually understand anything if you are repeating what you have been told. You have to rediscover everything yourself to truly understand it. The people that came before you have given you many shortcuts.
Also if your shoulder is sore, especially your shoulder do not strain it any more. Shoulders are complex and easily broken.
