The fallacy committed in the reasoning presented is the False Cause fallacy.
The fallacy committed by the reasoning, 'I ate a grapefruit, then it snowed... Therefore, I am going to eat a grapefruit next time I want it to snow,' is the False Cause fallacy. This fallacy assumes a causal relationship between two events without proper evidence to support it. Just because two events coincided does not mean that one caused the other.
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