Since the 10 Second Subtraction first became rule, I have never had it happen. The closest came in 2011, during a game at Texas Tech, but, dang it, the clock wasn't actually running when the FST occurred during the last minute of the game.
But, during a 9th grade game last night, we had a FST with the clock running during the last minute of the 2nd period. 10SS. Nailed it.
During the last minute of the 4th period, had a FST with the clock running. 10SS. Nailed it.
TWO in one game, after having gone some 12 years or so without one. Just proves that, if it is gonna happen, its gonna happen in sub-varsity!