(DAILYMAIL) — The four Colombian high school students were brought to the emergency room two weeks ago screaming and babbling.
There was nothing physically wrong with them. Instead doctors diagnosed a case of 'mass hysteria'.
The cause? They had been trying to summon a 'Mexican demon' with two pencils balanced on a piece of paper, like a modern version of the ouija board.
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In fact the spirit-summoning game known as 'Charlie Charlie' or the CharlieCharlieChallenge has since blazed a trail across the internet in recent days.
It went viral after one video surfaced in the Dominican Republic where it was taken probably a little too seriously by parents, priests and teachers.