I was flying out from Manchester Airport and when I got to the boarding gate, it had turned out I had left my passport at security. Literally, the flight was about to leave and they couldn't hold the flight any longer (I was starting the waterworks, naturally, as I just majorily failed and had no money to get another flight) but then the guy at the gate just told the staff to hold the flight and started sprinting towards security and came back about 5 minutes later with my passsport, almost having an asthma attack. Phew. <3