Arsenal away Boxing Day '77 and the taking and holding of the Northbank. I had toothache on Xmas day, luckily cleared up for the morning kick off next day, my best mate a QPR fan came around early and made our way to Parson Green station. Got to Earls Court where there was an almighty mob of Chelsea on the platform (no pubs open so a bit of decent organization for once). We got the train before them, Arsenal fans hiding their scarves on the train we were on and went straight into the Northbank. Went for a piss in the bogs at the tops of the stairs up and just as I came out saw the platform mob coming up the stairs and joined in as we all charged and cleared the end. Arsenal hardly tried to take it back, loads of skinheads over the far side, we walked right thought them more than once , there must have been the best part of 1000 Chelsea right at the back, a great end taking. Afterweards we walked unchallenged in a huge mob until we confronted another huge one at Finsbury Park station, also Chelsea.
Sad thing was two days later West ham did the same thing in the Shed.