Wow. Ari was impressed by the speed with which her classmates were coming up with jinx examples. So impressed that she started to think she should brush up on her knowledge of jinxes, in case someone would duel her. Not that it was very likely, but still. It was important to know how to fight back defend yourself.

'I've read a book about former Hogwarts Headmasters, and one of them, Professor Snape, invented the Langlock jinx, which causes one's tongue to get stuck to the roof of the mouth.' Nasty thing, by the sounds of it.