Do expectations play any part in reality?

A scheme well executed found me
at work beneath the surface of the ocean.
A most honest pursuit, the sea,
above and below, is unconcerned
with the posturing of the land.

One day, much anticipated,
I met a big enough shark.
I was looking for a dreadful creature,
a purveyor of fear and death.
I found an animal of unsurpassed grace,
and not at all concerned with me.
Just being in its element, alive
and perfectly suited for existence.

Every time I slipped beneath the waves,
the lizard in my brain would squeak.
It seems the ancient home reminded him,
never of the beauty, only of the beasts.
He was easily subdued by adrenaline.