Title: Dear Sir: Drop Dead! Challenges: Patented Daydream Charm snape100, Remus/Tonks lupin100 Note: this is a sequel to Take Your Son, Sir! clearly this is only partially canon-compliant. My apologies.
Weasley:
Your 'Patent Daydream Charm' is a failure. I expect a refund by return owl.
S. Snape
Dear Honored and Respected Former Professor:
Sorry to hear that you won't be joining our legion of happy customers. What went wrong?
Your rich and successful former student,
George Weasley
Messrs. Weasley:
Your product produces nightmares. I trust that is sufficient?
S. Snape
Dear HARFP:
What kind of nightmares? Even Professor Lupin liked it, and since his divorce he's hated everything.