 One thing you should watch for when you see someone opening your present, watch for the surprise. If they really are into what you gave them, it won't be a slow, oh, hey, as it dawns on, they'll see and go, oh man, you got it. You got me. And look for that Duchenne smile. And one thing everybody always goes to is, oh, you got to look for little wrinkles on the side of the eyes, because if you see a wrinkle, that means it's a real smile. Nope. No, it doesn't, because it's got to be the right kind of wrinkle. Anybody can squint their eyes and get a wrinkle there. What you're looking for is that little wrinkle that comes in at an angle like this. It doesn't come down squished like that. It comes down at an angle like that. If you see that, then you're seeing a Duchenne smile. And you see how far these little things go in. Make sure that goes deep. Make sure you see some teeth. Make sure that their eyes wide a little bit as they're looking at it. You also see their pupils dilate some. It's going to be hard to see all that when they first get it. But if they're sitting next to you or you can get a good look at them, look for those things. And you'll know whether that's real or fake or how excited they are. They may like your present or love it, but the level of like or love you'll be able to tell by using those things.