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."