one of many reasons I could never become a Buddhist nun:

garlic

Some Mahayana Buddhists refrain from eating strong-smelling plants such as onion and garlic and refer to these as the "Five Acrid And Strong Smelling Vegetables." There's a common story told about why it is, exactly, that onion and garlic are to be avoided:

Once there was a monk who, because of his compassion for sentient beings, was a vegetarian. There was a woman who decided to test the monk's resolve, and prepared a meal, telling the monk it contained only vegetables. In fact, the dish contained a scrap of meat. The monk gratefully accepted the meal and the woman left, thinking that she had tricked him into eating the meat. The monk knew this was a trick, and emptied his bowl onto the ground. The next morning, he found that two plants had grown in the exact spot he had dumped the lady's cooking: garlic and onion. It is for this reason that monks and nuns refrain from eating garlic, onion, and strong smelling plants.

I LOVE garlic. I think I must have eaten enough roasted garlic yesterday to... well... breathe on my enemies to death (or tears, anyways).