Mrs. Elder and I were in the air on our way to a European city with a quick connecting flight to Tel Aviv. Two and a half hours into the flight, the plane dropped to 10,000 feet and the captain told us that one of the two air pressure thingies (he may have had a more technical term) had failed so they had to descend to where there was actual breathable air outside.
Quickly switching the entertainment display to the world map, we saw that we were heading right back to where we started. Since we didn't quite make it to the Atlantic Ocean the pilot decided not to risk it.
So we had a 5.5 hour flight to literally nowhere.
No new flights available until tonight, so we've lost a day. Bummer.