I have a phenomenal sense of deja vu, and you have my profound empathy. (The last night of the 2009 Worldcon - in Montreal - I managed to back into a sharp-enough corner on my scooter that it popped the tire. Our hotel inflated it while gridlore and I had dinner, but it was flat again by the time we were done - meaning we were stuck in the room on the one night we had hoped to finally hit the party hotel together.)