This private lesson took place in Harry Potter's second year on 13 February, 1993 between him and Gilderoy Lockhart, the Defence Against the Dark Arts teacher at Hogwarts School at the time.

Lockhart sent Harry a letter asking him to come to his office for a private lesson, since he'd missed a class. There, Lockhart taught Harry how to use Verdimillious Duo, and then set Harry a little challenge involving trying to get past enchanted suits of armour.