you are not the source

  • Albus: I'm not the prankster type, but every so often, I like to owl my dad letters. From himself. From the future.
  • Letter: Harry, at 8am, someone will poison the coffee. DO NOT drink the coffee. Best regards, future Harry.
  • Hermione: [about to take a sip of coffee]
  • Harry: NO! [knocks mug out of her hands]
  • Hermione: ?????
  • Harry: You'll thank me later.