Old people dancing, over-animated tweens, over-sexed jocks, it’s all here. We present the worst music videos ever from Susan Boyle to Milli Vanilli and back again. Let’s start with Cher… 50 Cher – ‘If I Could Turn Back Time’ Nope, it’s not a Rihanna gig. That big-haired lady straddling the cannon is Cher. Although back in 1989, it stirred up just as much controversy, due to Cher’s nearly-naked sel