Final answer:
Under the Statute of Frauds, oral agreements for the sale of real estate are generally not enforceable. Bill Gates' full payment does not satisfy the SOF in this case.
Step-by-step explanation:
Under the Statute of Frauds (SOF), certain agreements, including contracts for the sale of real estate, must be in writing to be enforceable. In this case, Bill Gates alleges an oral agreement to purchase Gilligan's Island from Gilligan. While oral agreements can be binding in some cases, the sale of real estate generally falls under the SOF. Therefore, the full payment made by Bill Gates does not satisfy the SOF and the agreement may not be enforceable.