“That's a Foe-Glass. Lets me keep an eye on my enemies. If I can see...” – Alastor "Mad-Eye" Moody, Harry Potter and the Goblet of Fire ... Movie Quotes Database

That's a Foe-Glass. Lets me keep an eye on my enemies. If I can see the whites of their eyes, they're standing right behind me. [laughs evilly] [the chest is thumping] Wouldn't even bother telling you what's in there. You wouldn't believe it if I did.

More from Harry Potter and the Goblet of Fire

Sirius Black Look, Harry… the Death Eaters at the world cup, your name rising from that goblet, these aren't just coincidences, Hogwarts isn't safe anymore. Sirius Black If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals. Professor McGonagall The Yule Ball has been a tradition of the Triwizard Tournament since its inception. On Christmas Eve night, we and our guests gather in the Great Hall for well-mannered frivolity. As representatives of the host school, I expect each and every one of you to put your best foot forward. And I mean this literally, because the Yule Ball is, first and foremost… a dance.