It’s a picture which ended up defining him. He was asked to sign it many times during his lifetime, but he hated it.
The Tottenham legend even stopped his publisher from using the image on the cover of his autobiography, The Real Mackay.
“While other people like the photograph, I don't because it portrays me as a bully, which I am not and never have been," he once said.
The incident in question occurred during a Spurs v Leeds match at White Hart Lane in 1966 shortly after Mackay had recovered from breaking his left leg twice in the space of nine months.
Both players had collided near the touchline and Bremner reacted.
“Billy gets up and doesn't kick the right leg, which is nearer to him,” he said.
“He passes that and kicks the broken one. He knows which one's been broken. I could have killed him.”
It’s true Mackay was a hard player, but he was also one of the most talented. In nine years at Spurs he won the league, three FA Cups and the Cup Winners Cup before going on to manage Derby to title success.
Jimmy Greaves, a team-mate at Tottenham reckoned the midfielder could play in any outfield position.
“He was a genuinely hard b****d and a truly gifted ball player; a combination which is so rare,” he explained to the Sunday People in 2011.
“When Dave grabbed Billy it was probably the only time this nasty little player ever looked frightened in his entire career.”
Proud of having never been sent off, though, Mackay was relieved when the referee simply gave him a talking to.
WATCH: Bremner causes Kevin Keegan to lose it during the 1974 Charity Shield match