Gilan's advice from Ranger's Apprentice: The Burning Bridge. (by ~Lil-Treaty on deviantART). I am pretty sure that this is the best scene ever. This and the "Horace have I ever lied to you" scene in book eight. XD Far less messy.
This makes me laugh even though the Harry Potter nerd in me knows that's Blaise Zabini because Draco had to get a new friend because the actor who played Crabbe got arrested. Why are they holding hands though?