Mark Duffy is one of those players that when mentioned will always bring a smile to my face.
A football club's whole direction can change in just a few seconds within one game.
It was the day Sheffield football power flipped, the previous time being in 1979.
That is the beauty and agony of the game.
In THAT game in September 2017 the relative positions of United and Wednesday changed. Suddenly we were above them. Not just in the league (we already were), but because we stuffed them at their own ground and confirmed a sort of footballing superiority.
I will always think that it was Duffy's goal that did that.
Not just because it was actually a very, very good goal, but because in the context of how the game was balanced it was a killer response.
We had been 2-0 up. They had just brought the game back level. If we are honest we all feared the worst. Duffy scoring that goal so soon after Wednesday's equaliser cannot be quantified in terms of it's importance in affecting the direction of both clubs.