Nigel, My story is better. I didn't realize I had to register in a special way for the byes, so after the roster went up, I went to the masters help desk to see if they could help me.
They looked through the winners list, and I wasn't on there. So we had to run around the room looking for the guy who head-judged the regionals I won and ask him if I won.
So I successfully delayed 1500 people from starting a tournament. ^_^