Sum: What was the single thought that kept Sirius Black sane in Azkaban? Lol...
"You know I don't know how I did it actually..." Sirius Black said. He looked thoughtful. "Oh yeah, I just had to keep thinking about the last thing anyone ever said to me."

They waited.

"It kept ringing and ringing in my head you know? So soon all I could remember was..."

"Bring back milk".
Sorry it was short. Another challenge. Write a short fic about how Sirius was sane. Well I'm now 10 bucks richer again!