Easy? No. Subtle? Definitely not. Worth it? YES.
  1. My father will hear about this!
  2. God, this place is going to the dogs.
  3. If brains were gold you'd be poorer than Weasley. And that's saying something.
  4. You don't know what I'm capable of. You don't know what I've done.
    (if you want to straight up terrify them)
  5. I thought you were going to buy me a present!
  6. What happened to your face, then?
  7. Manners, Potter, or I'll have to give you a detention.
  8. Red hair. Hand-me-down robe. You must be a Weasley.
    (my personal favorite)