https://en.wikipedia.org/wiki/It_(novel)

The story follows seven children as they are terrorized by an evil entity called It, which exploits the fears of its victims to disguise itself while hunting its prey. It is a monstrous, shapeshifting predator that primarily appears in the form of Pennywise the Dancing Clown to attract its preferred prey of young children.

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you think this is based on a real thing that happened?

if you answer yes to this my next question is: are you retaded?