The best part of the technology is that you can use it the way you want. And if you are a creative guy with some wacky ideas then, it is even better. Here is a guy who made the Halloween costume using the two iPad 2 and the FaceTime app.
This geeky Halloween costume is made by using two iPad 2 to make it look like you have a huge hole in your torso. You'll also need a MiFi hotspot (if you don't have a WiFi network available where you want to use the costume).
Basically you start a FaceTime chat between the two iPads and then tape one to your front and one to your back. Add a little red paint and you're good to go. It's supposed to look like you have a gaping hole in your torso. Watch the video given below of the iPad 2 Halloween costume in action.