School teaches you that ignorance is shameful, rather than being a person’s default AND ENTIRELY FIXABLE state. Sucks the fun outta learning, if you let it.
I may have posted something to this effect before, but it bears repeating if so: This is a marvelous way of looking at the world, and may be one of the best lessons Randall Munroe has ever taught us. It certainly prompted a change in my own behavior. “You’re one of today’s lucky 10,000″ leads to a lot more fun in life than “What do you mean you don’t know about _____?”
Common sense is something you learned so long ago that you forgot learning it, and it’s extremely regional.
“What do you mean you don’t know about ____?” is perfectly acceptable way to precede the statement “well then today is your lucky day.” Say with enthusiasm and a nice big grin if you can.