[Announcement on Donation Opportunities] Vows that are not fulfilled because of circumstances beyond one's control. With the example of a court case, a man who filed documents in his favor, and he assures the court he'll return with a vow that the documents will be null and void if he doesn't come back in time. That's how certain he is that he'll come back. Which leads to an important dispute between Rava and R. Huna - is his vow upheld, despite the fact that he was prevented from return by circumstances beyond his control. Plus, a new definition of "asmachata" - a strong statement/promise to emphasize ones agreement. But is the asmachta actually binding? And is this case an asmachta case?!