Charms was always one of the best lessons in which to enjoy a private chat; there was generally so much movement and activity that the danger of being overheard was very slight. Today, with the room full of croaking bullfrogs and cawing ravens, and with a heavy downpour of rain clattering and pounding against the classroom windows, they were not going to get caught. Hermione had already silenced her raven and a bullfrog.