Mixed martial arts fighting is popular with the 18-to-34 demographic, said Roy Englebrecht, the founder of the Professional Mixed Martial Arts League, a minor league in California.

CNN: Fans attracted to 'forbidden fruit' of violence

But unlike the majority of David versus Goliath FA Cup fixtures, some non-league football fans have mixed feelings about the rise of Crawley.

BBC: Crawley ready for 'dream' Man Utd tie - Mark Stein

Tuigamala has mixed memories of the Leeds ground from his league days but admits the crowd always played a major role.

BBC: Quins look to down Falcons