The common room was quiet and the students were sleeping soundly, snug in their beds. He snuck quietly to the portrait hole, having an idea about where to play his trick. Pulling his invisibility cloak over himself, he slipped out into the castle.

Once inside the room, he gathered his potions and set to work. Twenty minutes later, it was ready. Quietly going back to his dorm, Viktor was excited.

The next morning at breakfast, Viktor went down to the hall and howled with laughter as everyone did the moon walk and spoke in limericks.

"Happy April Fools!" Viktor shouted.