Why does everyone think Harry stole the lollipop ! He didn't if he did you would see his hand coming out of the invisibility cloak or the lollipop would have turned invisible ! IT GOT STUCK TO THE FREAKING CLOAK!
Professors Snape, Dumbledore and Slughorn in the back ground is gold! They may be extremely powerful, wise and all knowing- wizards and yet teenage girl drama fascinates Dumbledore, baffles Snape and terrifies Slughorn.