Ill behaviour

It wouldn't have taken a genius to surmise that the fad for continuing to wear festival wristbands long after the event (a fad that I admittedly succumbed to, albeit briefly, way back in the day) might not be the most hygienic - but it's now been scientifically proven. So I'd suggest cutting them off - not least because if I were you and I'd paid good money to go to V Festival, I'd want to keep it very, very quiet about it.