Happened on my flight VS012 BOS-LHR yesterday (actually dep BOS 1/11 1940hrs arr LHR 2/11 0710). Chap went from Economy into Premium prior to the doors being closed - not exactly sneaking as he was about 6'3" and wearing a bright blue do-rag, and straight to the front of prem centre row.
I was initially a bit miffed as the only discernable on board difference between VS economy and premium is leg room (so he couldn't turn down any real additional benefits like an upgraded meal) but then decided I was being a bit poh-faced as it didn't affect me in any way and just left it. (For all I know he asked the CC before doing it.)
Maybe I am jealous 'cos I am not sure I would have the brass-neck to do it myself!
