Curse of the Bogies
From UnknowableWiki
The Curse of the Bogies is a spell mentioned by Professor Quirrell in his Defense Against the Dark Arts class.
When Hermione Granger, Neville Longbottom, Harry Potter and Ron Weasley are wandering after hours around the Hogwarts castle, Ron threatens to cast this spell on Hermione and Neville, should they be the reason for the others to get caught (PS9).

