PATAVINUS

Patavinus are anonymous chats, which you can attach to your valuables, so that if you lose it, a finder can easily contact you. They want a world without losers and with a lot helpers! They lost stuff at the festival. In order to test the helpfulness of people, they need to lose keys, smartphones etc. And see if finder contacts them via the chat. Furthermore, they talked to people to see some drawbacks in their UI.