Three Yogis leave behind their homes to meditate in a remote cave. One day, a sound is heard from outside the cave. After about six months, one of the Yogis says, "Did you hear that goat?" Once again, there was silence. About a year later, one of the other Yogis says, "That wasn't a goat, it was a mule." Again, there was silence. About two years later, the third Yogi says, "If you two don't stop arguing, I'm leaving."