Knockback Jinx

The Knockback Jinx, a useful spell taught at Hogwarts School of Witchcraft and Wizardry. It is taught in year-one defence against the dark arts classes, and is exceptionally well-known for being painful - as though having been hit over the head with a saucepan. It is also useful in repelling such creatures as imps, fire crabs, and other pesky beasts.