Whence I was a Trainee Flaggie, I was posted at Clay Hill at Oulton Park.
The two Observers were both very experienced but a little elderly and and used to chat about gardening more than racing.
One Sunday afternoon during a BTCC race, one of the observers had his ear-piece plugged into his radio - NOT scanner and was listening to the GP of Monaco. I was trying to concentrate on the race in front of me when all of a sudden the observer excitedly jumped up and shouted "RED FLAG". I immediately picked up the red and looked both up and down the track, waiting to see likewise flags. None appeared! Apparently David Coultard had crashed off in Monte Carlo causing a race stop OVER THERE! It was fairly amusing but also worrying....especially as this observer is now a senior official!