After the testicular cancer diagnoses of Sébastien Haller and three other Bundesliga players, we wanted to raise awareness for urological check-ups and created a stunt in Borussia Dortmund's stadium during matchday: On World Cancer Day, we added a big irritating bump on the center circle to symbolize a testicular tumor. But fans and media didn't know the meaning at that time and the speculation started, creating worldwide attention for our important message at halftime.