I did find that reference quite amusing. I had assumed Harry was being sarcastic in chapter 6:
Professor McGonagall pointed toward a shop that looked as if it had been made from flesh instead of bricks and covered in fur instead of paint. “Small pets are permitted at Hogwarts—you could get an owl to send letters, for example—”
“Can I pay a Knut or something and rent an owl when I need to send mail?”
“Yes,” said Professor McGonagall.
“Then I think emphatically no.”
Professor McGonagall nodded, as though ticking off a point. “Might I ask why not?”
So Dumbledore killed Harry’s pet rock. Best twist ever.
I did find that reference quite amusing. I had assumed Harry was being sarcastic in chapter 6:
Nah, in chapter 33 we have Harry irrationally worried that Hermione is dying rather than just Somnium-ed:
(Which had me in stitches.)