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While the face-scanning tech can work really really well (see our thread for some great examples of it working right) it also can create beings of a sort that will give you nightmares for weeks.
We're talking Silent Hill, Resident Evil, Left For Dead type of grotesque here. A team full of these 'things' is probably a viral video waiting to happen.
To get a proper Facescan, you have to carefully follow the on-screen instructions while ensuring you have proper lighting. A lack of either can result in some really messed up situations.
I hope you sleep well tonight.
Update: Some are asking how to scan your face properly. Here's a great video from ipodkingcarter showing you how to properly scan your face.