Yuri makes a gratuitous promise to Rav, fully intending to keep his promise. However, Yuri later finds it inconvenient to perform what he promised. Meanwhile, Rav has reasonably relied on Yuri's promise and has incurred expenses that he would not have otherwise incurred. What happens? Does Rav have any hope of relief?

	1.	A lawsuit happens next - a gratuitous promise is a promise like any other promise and can be enforced.
	2.	Yes, there is relief. Rav can sue Yuri for breach of contract under the strict rules of contract law.
	3.	Yuri may rely on the principle of equitable estoppel to defend himself against Rav's lawsuit, on the basis that his promise was a gratuitous one.
	4.	all of the above.
	5.	The principle of equitable estoppel, where the court exercises its equitable jurisdiction to estop a promisor from claiming that he was not bound by his gratuitous promise where reliance on that promise caused injury to the promisee, may provide some relief.