I heard a frog last night as I drifted off to sleep. It's sound was like a plaintive cry in the dark, a frog with perhaps only this one moist night to find a mate. Like one of those creatures who only live for 24-hours when it rains, then die.
Then I decided to hear it as joyous singing. It became a frog who was so happy that it couldn't help but stay up all night singing praise to the night sky.
Funny how our mind can change our perception--and thus experience--of reality.