Jelly-Brain Jinx

The Jelly-Brain Jinx is a jinx that presumably affects the target's mental processes. During the September 1999 riot that took place during the Puddlemere United/Holyhead Harpies Quidditch game, many of the Harpy supporters were using this jinx. This spell may have been the spell that the Death Eaters hit Ron with in Harry Potter and the Order of the Phoenix in the Battle of the Department of Mysteries.