Only the genuine highlights of RPG.net discussion make it to this blog, but the following, from a "give people good advice" thread, is simply wonderful:
Never, ever punch the air in celebration if there's a lightbulb above you. You will send yourself, or anyone standing near you to hospital.
I like the fact that it's so specific. I also like the fact that it fails to take into account most of the factors which cause the accidents it's trying to prevent.