I walk into the computer room, where my brother is sitting reading something online.
Me: "So what are you reading?"
Brother: (after a mad scramble to change windows) "Nothing! Nothing!! Go away!"
Me: "Oh, Harry Potter fan fiction? So what? Sometimes I read Harry Potter fan fiction."
Brother: "Well I don't!"
Me: "You were clearly just reading it."
Brother: "I was not!!"
Me: "Wait till I tell all your friends."
Brother: "Wait till I light all your yarn on fire!"