Yesterday’s Swedish Post idea was to promote the generic use of snail mail. In this case, the campaign is for their green pre-stamped parcels that allow users to send almost anything overnight.
80 random objects were packed on the parcels and the sound of them being shaken was recorded. The recordings were then posted on a website for people to guess what was inside. The correct answer would receive the gift delivered to their door the next day.
Great product demonstration and use of social media as participants could easily involve friends to get help in answering correctly. Again, very impressive results.