A description of a relatively simple
using 2 iPad2s 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 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.
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NOTE: The iPads were borrowed. This costume cost me $4 to buy a white shirt a Goodwill. If you spend more time than I did on the blood and the flesh part and lining up the iPads it could look pretty cool.