By the time Harry attended his Defence class that afternoon, it was obvious to him that Ginny (because Hermione had been with him all day, so it couldn’t have been her) had been disseminating his jinx through the other years. Every surface in the classroom was covered in dust, and more than one student yelped in surprise when they touched the doorhandle and received a shock for their trouble. Eventually, Anthony Goldstein had had enough, and stood to wedge the door open with a chair to avoid anyone else having to touch it.