My father was in sound show in Franckfort. He was invinted with a friend in a hostel in order to assist to a presentation of new sound system by the biggest sound system manufacturer of the world: Clair’s Brothers. In this presentation my father recognized an man he knew from his former job in Arras. My father knew this man was a scammer. Indeed in 2007, this man scammed more than 100 000€ of the Bollaert stadium pretending he was a the Robbie William’s manager. During the presentation, a man who was talking with my father and his friend say that this man ordered more than 220 sounds systems for a several millions of Euros of prejudice. My father knew that this was a scam and at the end of the Presantation he decided to warn the sound system constructor of the scams this man has done before. The constructor thanks my father and stopped the construction the day after. At the end of the presentation the man recognized my father and try to accompany him to his hotel. The man was very insistent and strange and he start to followed my father. My father start to worry but the man suddenly leaves.