Ooooh...that would have sucked! LOL. The closest I came to that scenario was flying on FL a few years ago, headed to ATL from BWI. I was standing at the end of the jetway with one other non-revver...he got on, and just when I put my foot on the jetway, it was like "Uh oh...sorry, someone was in the lav and we did not count them". It worked out pretty well, though, as I was not in a rush to get where I was going. Came back later that evening when the load was lighter and was rewarded with a 1A seat.