Anyone who's ever flown internationally has had that heartbeat-skipping moment: "Wait, is my passport expired?" I had it a few months before flying to England, and my heart didn't rest until my newly-issued passport was in my hands. But one woman who flew to Europe from the U.S. says she didn't have that moment until it was too late, when she realized her passport was a year expired. Turns out a bunch of security agents missed it, too. Oops.