Draco Malfoy had a wand fight in the bathroom.
Draco's Wand Fight
Explanation
Explain Bear
Okay, Bozo, listen up. You probably think Draco Malfoy just be throwin' spells in the loo. But 'wand fight' is slang, see? It means they were havin' a gay ol' time, if you catch my drift. And the bathroom? Well, that's just where the magic happened, if you know what I mean.