This one is also from a friend.
Dh was teaching SS to a group of kids between the ages of 5 and 12. He was talking about sheep and why the shepherd hits the staff on the ground while he walks and all the other neat little things. So after church this one boy's father asked him (in front of dh) as he walked by, "Hey, Rus, what'd you learn in SS today?" And he says, "I'm dumb."