Three yogis are performing a meditative vigil in a cave high in the Himalayas.
One day there is a sound outside of the cave. Six months later one of the yogis says, "that was a tiger."
The cave is silent once again.
About a year later, another yogi says, "that wasn't a tiger it was a lion."
Again the cave falls silent.
About two years later the third yogi says, "If you two don't stop arguing I'm leaving."