You know you're bored when... you start a forum thread about how to know when you're bored.
(Sorry zero, couldn't pass it up.)
You know you're bored when you have beaten all the candy crush sagas WITHOUT PAYING and you're wishing they would make more of those games. Beating them without paying takes somebody who has way too much time on his hands.
(Hint: If they advertise "free" games on TV, they are PAYING for those advertisements, so there is a REASON they want you to play those "free" games.)