Ron, you're making it snow," said Hermione patiently…

““Ron, you're making it snow," said Hermione patiently, grabbing his wrist and redirecting his wand away from the ceiling from which, sure enough, large white flakes had started to fall. Lavender Brown, Harry noticed, glared at Hermione from a neighboring table through very red eyes, and Hermione immediately let go of Ron's arm. "Oh yeah," said Ron, looking down at his shoulders in vague surprise." Sorry...looks like we've all got horrible dandruff now…" He brushed some of the fake snow off Hermione's shoulder. Lavender burst into tears. Ron looked immensely guilty and turned his back on her. "We split up," he told Harry out of the corner of his mouth. "Last night. When she saw me coming out of the dormitory with Hermione. Obviously she couldn't see you, so she thought it had just been the two of us." "ah," said Harry. "Well - you don't mind it's over, do you?" "No," Ron admitted. "It was pretty bad while she was yelling, but at least I didn't have to finish it." "Coward," said Hermione, though she looked amused. "Well, it was a bad night for romance all around. Ginny and Dean split up too, Harry." Harry thought there was a rather knowing look in her eye as she told him that, but she could no possibly know that his insides were suddenly dancing the conga.””

— J.K. Rowling