Water balloons eh? And no Professor, not all of your students have puberty-infested noses like you say. Anyway, that wasn't why they were getting water balloons thrown at their faces. It was to practice their spell work. Stepping into line, Lily noticed the first couple of people in line failed to stop the balloon on the first try and ended up getting nice and wet. Then there was a good group of people who managed to stop their balloons and not get wet. And then there was the one poor kid who ended up poking his balloon and getting drenched anyway. All the while that Lily waited, she practiced her wand movement and the incantation. She wasn't going to get wet... that was for sure!