Ron: What do you suppose is on Karkaroff's arm?
Harry: I dunno.
Hermione: Boomslang skin and Lacewing flies... you're sure those are the two ingredients Snape mentioned?
Harry: Positive, why?
Hermione: Well, he thinks we're brewing Polyjuice Potion doesn't he?
Harry: I don't care what Snape thinks, I've got bigger problems than detention. Something's coming closer.
[touches his stinging scar]
Harry: I can feel it.