Not quite the same but I arrived at the MKM Stadium a couple of years back and wandered to the automated turnstile armed with my match ticket. The barcode scanner appeared not to work at first and I started to feel unease. Then I heard a mechanical click so assumed I could proceed, however, the turnstile itself was still unresponsive. I then realised that the mechanical click I heard was the adjacent turnstile. In that brief period of time, the chap behind me had approached the turnstile scanner that had refused me and presented his ticket which then opened the previously unresponsive turnstile. I thought "how marvellous", and wandered through feeling somewhat relieved as it locked behind me. As I climbed the stairs, I furtively glanced back to see my unwitting partner in crime remonstrating with the stewards as to why he couldn't get in.
I thought to myself, "I must try that again sometime "...