IT in Equestria

Pennywise the Dancing Clown scares Scootaloo, Pinkie Pie steps in - giggling at the ghosty ensues.

It is real.
It is in Equestria.
It is lurking under Scootaloo's bed.
But It is not prepared to deal with a certain pink party pony.

This story is (obviously) a crossover with Stephen King's IT.