I was caught short on a flight into RDU many years ago, but I was actually in the facilities when we started to approach. The CC did not even know I was in there, and were quite surprised when I emerged a few seconds before touch down. I had an aisle seat, so sitting down was quite easy. I returned to said facility as we taxied (the crew were up and around by then). Not an experience I would like to repeat - I did feel at one stage I was not going to be able to leave the bog before landing. Sometimes your body just does not listen to sensible advice.
I have never eaten Wendy's since.