About two years ago, me and my partner gave ourself 48h to launch a project. We never touched it since then and the database has more than 1 gig of data by now... I guess there should be something to do with it but we never had the time and/or motivation to touch it again after that.
We still managed to get some coverage (press, tv, etc.) on that so even if it's not something really complicated, I'm still proud of it.