MORE than 400 students took part in the biggest flashmob ever at The Trafford Centre this week in a bid to boost the image of youth in the northwest. The performing arts students from the Pendleton Sixth Form Centre of Salford City College, performed a unique, choreographed routine put together by tutor Hannah Paice. Lasting for four minutes, the performance was set to a sound-track of music clips from the last 30 years - including Michael Jackson and Bon Jovi.