I know the syllables aren't precisely accurate but hey, I wrote this when I was in 6th grade.

There once was a hermit named Mark
Who lived inside of a shark;
He liked it a lot--
The shark did not--
So the shark spit him out of the park.

When he landed he was so mad,
The shark was very much glad;
He swam down deep
Where bad fishies sleep
And told it all to his dad.

His dad was really very proud,
So proud he shouted out loud;
The fish went a swimming,
For the dad was a grinning--
They swam like a thunder cloud.

Mark was simply very broke;
He had no food, not even a coke;
He wanted to die,
But was given a pie,
And thought it a cruel life's joke.

There once was a hermit named Mark,
He did not live inside of a shark;
He lived on the land,
On the pretty white sand,
But never forgetting that shark.