1. The Gemara discusses the case of two pregnant women who developed a craving for food they smelled on Yom Kippur.
2. If a sick person says that he needs to eat and a doctor says that he does not, we allow him to eat.
3. If the doctor says that the patient must eat, and the patient says that he does not need to eat, we listen to the doctor.
4. We clear away piles of rocks from a fallen building on Shabbos even if we are unsure about whether the person trapped underneath is still alive.
5. One is allowed to lie in order to retrieve his stolen items from a thief.
A BIT MORE
1. One of the women refrained from eating after someone whispered to her that it was Yom Kippur. She gave birth to a child who grew up to be Rebbi Yochanan. The other woman ate, even after someone whispered to her that it was Yom Kippur, and she gave birth to a child who grew up to be a wicked person named Shabsai Otzar Peiri.
2. This is as the verse states, "A heart knows its soul's bitterness" [more than others know].
3. We assume the patient is not of sound mind, at least in this matter.
4. We also clear them away even if we are unsure about whether the person is even under the pile.
5. When Rebbi Yehudah's purses were stolen by an innkeeper who denied doing so, Rebbi Yehudah later lied to the innkeeper's wife saying that her husband had told her to return them to him.