“I don’t think you should be an Auror, Harry,” said Luna unexpectedly.  Everybody looked at her.  “The Aurors are part of the Rotfang Conspiracy, I thought everyone knew that.  They’re working to bring down the Ministry of Magic from within using a combination of Dark Magic and gum disease.”

Harry inhaled half his mead up his nose as he started to laugh.  Really, it had been worth bringing Luna just for this.

Harry Potter and the Half-Blood Prince – J.K. Rowling