O'Leary picked up Allen by the scruff of his neck and carried him some yards .
In 1989 , an incident between Allen and David O'Leary sparked a mass brawl at Arsenal 's Highbury stadium .
David O'Leary picked up Allen by the scruff of Allen 's neck and carried him some yards .
In 1989 , an incident between Allen and David O'Leary sparked a mass brawl at Arsenal 's Highbury stadium .