what would you put in a box to give people in the future an idea of life today? why?

Technical progress and media influenced our lifestyle the most. So, in my opinion, the thing that has to be put in a box should be related to these sides of our lives. For example, I'd like to choose a piece of advertisement which represents the most popular modern trends (like a famous TV series, or an important event). It would be also good to put an electronic device which is widely used around the globe. Anyway, I think that the item in that box has to be a reflection of our lifestyle.