I was just watching a track meet in France and in the 3000m Steeplechase they mistakenly rang the bell with 2 laps to go. The race leader crossed the finish line and thinking he won put his arms up and slowed down. Then the rest of the runners kept going and so he jumped back in the pack and ran the real last lap. It was the end of the show and I didn't hear what they were going to do about it. Track workers had even started to remove the barricades before the final lap. Pretty monumental screw-up for some official I think.