This is a really cool game from Carlsberg and Åkestam Holst.

Take on as many of the 500 missions you can. Most of them are designed to spread joy. A list of missions can be found at unbottleyourself.com or via an app available now for Android or iPhone. To take part in a challenge, players must download the app and shake their phone to select a random mission. To earn points they must complete the task, either validating it themselves or uploading a photo or video as proof, in some cases performing under scrutiny of judges.

Grand Prize: a trip for two to Hong Kong.