1- your leaving a 14 year old alone at home for a couple of hours. Dont ask if they want a babysitter, it insults their intelligence.
2- a wall has a sign on it. "wet paint". always check, the sign may be lying.
3- never sing out loud if your singing in another language. I tried it, it freaks people out.
4- Take part in "talk like a pirate" day. Everybody smiles as they shy away.
5- normality is overrated. You shouldn't bother with it.
6- never ask someone younger than you "and how do you spell that?" it makes you look stupid.
7- if an eleven year old is doing their homework, dont look over their shoulder to see if you know the answers too. You'll only prove to yourself that you dont.