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"I'm warning you Hermione, keep that bloody beast of yours away from Scabbers or I'll turn it into a tea cosy!"
Ron[src]

This spell could be used to transform a cat or kneazle into a tea cosy. Ron Weasley was capable of performing this spell, and warned Hermione Granger that if she didn't keep Crookshanks away from Scabbers, he would use it on him.

Appearances