Knock Knock

"Knock knock," Ella says. I know the routine.  "Who's there?" "Boo..." she continues. I then ask her the only appropriate question, "Boo who?" "Boo penguin!"  She giggles, knowing the joke makes no sense, but she can't remember how it actually goes.  But  she's five and it's cute, and I love her to pieces.  We spend the …