You know what I hate? Fortune cookies that don't have fortunes in them. A fortune is "you will meet a handsome stranger" or "beware the number five." A fortune is not "you are very determined and confident" or "you like Chinese food." It's not called a compliment cookie or an observation cookie. It's a fortune cookie.
Which brings me to the other thing I hate: PostSecret postcards that don't have secrets. It is not a secret if everyone already knows. It is not a secret if it is a platitude. The concept is not complicated. Write something on a card that other people don't know. Send it in.