She spies the familiar glint in his eyes. The one that tells her he is about to do something incredibly stupid. Or perhaps he has already done it. He exchanges glances with his twin and seemingly gives the signal. Blood suddenly spurts from his brother's nose like a fountain.
She summons the other half of the Nosebleed Nougat then shoves it into his mouth.
Minerva McGonagall is not so easily fooled.
"Five points from Gryffindor."
Prompt: Familiar