Don't turn your head away from your webcam. Turn away and you're dead!
This site is a demo of tracking.js and requires a computer
with webcam (sorry mobile users), HTML5 browswer, and good light on your face (otherwise it can't track).
A lot of backlight will break the facial tracking, so keep that in mind.
INSTRUCTIONS: Look at the angel for a bit, then turn your head to look away... if you dare.
The Weeping Angels are by far the best villain in Dr. Who. They were first introduced in "Blink"
(S3E10 of the 2005 series) and have been terrifying the audience ever since.