Wisdom.

I believe in making the world safe for our children, but not our children's children, because I don't think children should be having sex.

One thing kids like is to be tricked.  For instance, I was going
to take my nephew to Disneyland, but instead I drove him to an old
burned-out warehouse. "Oh no," I said, "Disneyland burned down."

If you lived in the Dark Ages and you were a catapult operator, I
bet the most common question people would ask is, "Can't you make it
shoot farther?"  "No, I'm sorry.  That's as far as it shoots."