"You can't DO that!"
"It's only a Transfiguration," said McGonagall. "An Animagus transformation, to be exact."
"You turned into a cat! A SMALL cat! You violated Conservation of Energy! That's not just an arbitrary rule, it's implied by the form of the quantum Hamiltonian! Rejecting it destroys unitarity and then you get FTL signaling!"
Ling: "Did you notice [Envy's] footprints, back when we were fighting in the forest?"
Ed: "What?! No! What's your point?"
Ling: "Just that he's freakishly heavy for the size of his body. He might be a bit bigger than he looks."