Violence between football fans is a major problem. One of the big fights in the Bundesliga is the north derby Bremen vs. Hamburg. Two rivals never to be unified. We overcame this fan rivalry by using Sky Go, the mobile subscription of the football channel Sky, in a unique way: fans without tickets for the sold-out game were able to stream it on their phones – but only half of the picture! One half for Bremen fans, one half for Hamburg fans. Thus two rival fans had to put their phones together to see the whole picture – live outside the stadium.