“Warning: there is a Boggart on the loose in Times Square,” she captioned a photograph of an unidentified performance artist dressed as Trump in New York.
Per Rowling’s Pottermore website, a Boggart assumes the form “of whatever most frightens the person who encounters it” and may be found “lurking in woods and around shadowy corners.”
It can be defeated, however, by the “Riddikulus” spell, which “involves making the creature into a figure of fun, so that fear can be dispelled in amusement.”
Rowling has previously said her most evil Harry Potter character, Voldemort, is “nowhere near as bad” as Trump.
Naturally, many people on Twitter appeared to enjoy the latest taunt: