Kinder Surprise is a great idea but sadly for the manufacturers kids stop buying them when they hit their teenage years. To reach this market I think they should launch Emo Surprise. There are so many things you could have inside - eyeliner, sad poetry, razor blades etc. You could probably have a golden ticket thing too where if you find it you get to go to a Cure concert or one of those more recent Emo bands.
They could have Middle Age Surprise as well. Normally they wouldn’t have any surprises in them, then one day you’d buy one and it would have a note telling you that your partner of 15 years is gay and has been having it off with the hairdresser.