Back when Wrox was still going, I went out to India for six months to set up an office out there. On one of the initial recon trips before the move, I got the airport to find the Indian visa had expired and with a very embarrassed look on my face returned to the office and felt stupid for a few days.
Looks like Dan Kent managed the same trick and failed to fly to Tech Ed because his passport had expired. Only difference between these stories is that he managed to renew his passport quickly, fly out to sunny San Diego and be awarded a t-shirt for his numptyism.
Good job he wasn't a journalist, like this person. Any more frightening travel stories out there?