I stumbled upon this Youtube video and at first I didn't get why this guy kept flexing his face and looking so weird. I hadn't really read the info first, so when I did I was amazed. For around $700 you can look like this dude for your next Halloween party. Or if he doesn't float your boat, there are several other ones that might. I didn't publish the old lady head shots, but she is too realistic to be believed. You might not be a credible witness if you saw a crime being committed using this product.
After you look at this video, google SPFX Masks and see the others.