As a kid, Michael M collected a notebook full of information related to Jurassic Park, as if he worked in the computing department of InGen, the company that built the park.
The dossier is fairly thick and contains numerous completely made-up documents like dinosaur tooth records, DNA diagrams, and correspondence between myself, my imaginary colleagues and some of my friends from school whom I'd somehow managed to rope into my delusions.
Broadly, the dossier consists of the impossibly dull minutiae of park admin leading up to the events of the movie. I essentially gave myself a boring office job in my spare time outside of school. If nothing else, it's a fascinating insight into the mind of the type of pubescent idiot who never had a sun tan.
Love this. I definitely did stuff like this when I was a kid, but not nearly as elaborate. (via @robinsloan)