A loud bang brought Harry back to where he stood: Disoriented, he raised his wand, but the witch before him was already falling forward; she hit the ground so hard that the glass in the bookcases tinkled.

“I’ve never Stunned anyone except in our D.A. lessons,” said Luna, sounding mildly interested. “That was noisier than I thought it would be.”

Harry Potter and the Deathly Hallows – J.K. Rowling