World of Warcraft features a children's doomsday cult.

Occasionally, a group of children appear in a house on the edge of Crystal Lake, standing in a pentagram design. They never stray far from the building, and never break formation. They aren't a part of any quest line, and Blizzard customer support gives no definite explanation for their presence. Some players think they're creating a code with their pentagram movement and it's yet to be cracked.

Blizzard