There is a nutty rule in my family that you cannot walk on a carpet that has fresh vacuum lines on it. I was teaching Emma the forgotten art of vacuuming from one corner of her room and working it all the way out the door. During the lesson she walked across my fresh lines; I stopped and pointed out, “Emma, did you see what you just did?” Clueless, she looked at me and said, “I walked on the carpet??” Incredulously, I said, “Um, yeah?!” She still doesn’t get it.