Boggart-Banishing Spell

Riddikulus is a charm that is used in defence against a Boggart. It causes the creature to assume a form that is humorous to the caster, thereby counteracting the Boggart's ability to terrorize. Boggarts are defeated by laughter, so forcing them to assume an amusing form is the first step to defeating them.

Professor Remus Lupin taught this to his third-year Defence Against the Dark Arts class. Thanks to Lupin's teaching, Harry Potter was able to use this against a Boggart in the Triwizard Maze in 1995.

Appearances

 * Harry Potter and the Prisoner of Azkaban
 * Harry Potter and the Prisoner of Azkaban (film)

Etymology
"Riddikulus" is an adaptation of "ridiculous".

Notes and references
Riddikulus