Me (reading from The Story of the World about Shamshi Adad, the Assyrian king, and thinking that maybe this isn't the best reading material): "When he conquered a city, he chopped off the heads of all the leaders and put them up on stakes around the city."
Calvin: "They did the same thing in Shakespeare's time."
Me (somewhat skeptical): "Really?"
Calvin: "Yes. They cut off the heads of traitors and put them outside the Tower of London. And other places."
Me: "Where did you hear that?"
Calvin: "I read it in a book about Shakespeare. A book you gave me." (My emphasis. Because really, that needed to be emphasized).