Oddly enough, my greatest moment (at least to me) seemed innocuous when it happened. It came during my only 800 series.
I have a few 300's, tons of 700's, but only one 800. The moment was the eighth frame of the last game. I had already been adding things up and knew that if I carried in the eighth on a string, all I would need was count and spares to make it. When it carried, it was as if 10,000 pounds had been lifted off my shoulders. I can still see it in my mind as the ball hit the pins and they all went down. I spared the 9th and 10th, struck on the fill ball for 812.
No, the eighth frame didn't guarantee the 800, but without it, it would have been almost impossible to get there.
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"The difference between stupidity and genius is that genius has its limits."
Albert Einstein