The roar. That roar. It made the hairs on the back of your neck stand on end.
And that was just the one which carried Nottingham Forest down the tunnel at half-time. By the end, the City Ground was at fever pitch; a frenzied cauldron of noise, scarves being whirled and limbs going in all directions.
All through the second half the stadium had been rocking. Every touch, every tackle, every attack and everything in between was greeted with the kind of ear-bleeding explosion which makes you stop and just soak it all in.