Great memories. Did a similar thing at The Dell in the early 90s. They had some construction at the ground with chain link fence at the archers end. My self and a few buddies slipped through the fence late one light after several drinks. We made our way to the pitch. I recall the goal posts were down and some drainage work was in progress...as luck would have it we founds a cheap plastic football at the side of the pitch. Nothing for it but jumpers and coats thrown on the ground as make shift goals and a quick game of 2 verses 2...The high light was a wonderful hat trick by yours truly....and a buddy running after a wayward ball only to tumble 5ft into a freshly dug, muddy drainage ditch.....good times!