JUST nine months after vowing he would never enter X Factor, "cheeky" singer Sam Callahan has sailed through to the ITV show's boot camp stage. Singer Sam 'wants to prove Gary Barlow wrong' on X Factor Charity skinny dip swimmer defies police warning The 19-year-old, from Great Totham, won over the judges – apart from Take That's Gary Barlow – at the Cardiff audition aired on Saturday.He then ...