Harry Potter and his friends are once again working their magic in the muggle world.

From black wizard robes to the Golden Snitch necklace, fans in uniforms and badges representative of the four houses of the Hogwarts School – Gryffindor, Slytherin, Ravenclaw, Hufflepuff – flocked to cinemas nationwide over the past weekend in what many have described as "Hogwarts School reopening days."