I would go even further back and say Huddersfield at home. 28th December 2010.
We were 1-0 down and being given a bit of a lesson by a very confident Huddersfield side. We had conceeded early, Lee Novak heading one in on 15 minutes, but the real moment came when Scott Arfield missed a sitter shortly afterwards.
From then on we went rampant. Goals from Lambert and Chamberlain on 28 and 32 minutes gave us the lead. With the game turned on it's head we controlled the second half and thanks to goals from Jaidi and Chaplow we prevailed as 4-1 victors.
The win took us into the top 6 for the first time that year and started us on a 12 month run of being unbeaten at home in the league. That was the moment for me when our momentum took a devestatingly upward turn.