Can a human eat watermelon whole?

No, a human cannot eat a watermelon whole. Watermelons are too large to fit into a human's mouth, and the rind is too tough to chew. Even if a human could fit a watermelon into their mouth, the seeds would make it difficult to swallow. Additionally, the rind of a watermelon contains cucurbitacin, which can cause stomach problems if consumed in large amounts.