More video help? (reward)

k, so i know i'm always asking for you to find me videos, but i just remembered a video i love...


so the only thing i remember is that the creator mixed the part where hermione's yelling @ ron and harry @ the yule ball, and the part where draco is found "gatecrashing" slughorn's party...
the result is hermione saying, "you know the solution then don't you?" and draco replies, "certainly." i can't find it!!!! ahhhhh!!!!!!!!!!!!!!!!!! please help

oh... btw, the reward is a prop in each category!!!