By Pete Allison & Asad Awais
BBC Newsbeat
Football fans are known for being loyal and doing as much as they can to try to help their team win.
But a minority of supporters think that means chanting about tragic events involving the opposition.
At June's FA Cup final, a man took it a step further and wore a Manchester United shirt that made offensive comments about the Hillsborough disaster.
Ninety-seven Liverpool supporters died as a result of a crush at Sheffield's Hillsborough ground in April 1989.
So with a new season beginning, English football's governing body the FA has announced new rules that include a section on tragedy chanting.