Well, I just got through explaining about surprises, and how he couldn't tell Grandma Anne about her present until she got to unwrap it, because it would spoil the surprise. I told him that he couldn't come in our room, because mom was wrapping up one of his presents. "We don't want to spoil your surprise," says I. He pondered this a few moments, and then told me, quite earnestly: "Don't worry, daddy, I won't spoil your video game surprise from Grandma Anne."
* sigh *