In Defense Against the Dark Arts, in Harry Potter and the Prisoner of Azkaban, the students were taught by Professor Lupin to defeat the Boggart that was in the cabinet. Boggarts would take the shape of their deepest fears, and to repel it, the students had to learn how to laugh at it. They did this by casting the spell Riddikulus to turn it into something amusing.

I found this Boggart cabinet online, but it was very plain, so I painted it to make it look aged and to give it more personality.