So DQ is using a coefficient of friction to determine whether their ice cream is up to scratch. The spoon or ice cream falls out, the coefficient of friction is not high enough. The spoon or ice cream remains unmoving, it's up to scratch. But one more physics property could explain this, could it be a vacuum/ suction between the bottom of the cup and the small liquid layer at the bottom of the ice cream? It's for you to decide, but a blizzard tastes great to me regardless of it staying in the cup or not.
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