“Donna, I don’t-“

“The stick turned blue,” she says.

“Sorry?”

“The… stick… turned… blue…” she says, enunciating each word very carefully.

The Doctor blinks. “The crow flies at midnight,” he says after a moment.

“What?!”

“Oh sorry, I thought we were speaking in some sort of code.”

– Million Dollar Baby by pocketmyriad

I laugh everytime I read that. This is why I love fanfiction.