I don't have kids, but I know that you are supposed to "baby proof" your house like putting covers on electrical outlets so babies can't jam stuff in there and electrocute themselves. But those covers are so ugly. I like this idea: stick up this decal from Gecko Stickers as a visual warning. It looks cool, and those kids have to learn anyway, right? Bonus: it glows in the dark, and you can customize the non-glowing part of the sticker with one of over a dozen different colors. (Okay, we don't actually advocate allowing your children to electrocute themselves. It just makes for more amusing copy).