William wandered into the Room of Requirement. To his surprise, there were a lot of people in here, many more than he had expected to find. The room was getting really warm from all the body heat.

Instinctively he reached into the pocket of his robe and brought out his egg Mischievous. He was not surprised to find that Mischievous was hot. In fact the egg was sweaty, so warm that it was actually making his hand sweat to touch it. His hand was so sweaty that Mischievous was beginning to stick to it, and he knew that this was not a good thing. He was going to have to cool the egg off quickly or there would be a problem.

William reached for his wand and then pointed it at the egg, which he had set down on the floor at this point. "Argentum Frigidus" he said, swishing his wand and tapping it lightly against the egg at the same time as he uttered the incantation as he had been taught in Charms class.

William saw that the egg had cooled down and he reached to put it back into his pocket. Mischievous gave a little skip but then allowed William to pick it up and return it to its home, the pocket of his robe. William wasn't going to come here again, at least not while he was taking care of this egg. He didn't want to risk Mischievous overheating like that again.