The Explorer

There once was,
This little butt.
Who knew not how to ignore.

He bounced around,
Then came upon,
Something resembling a door.

"I wonder what to do?" He wondered.
"I ponder where it goes?" He pondered.
"I wonder what to do?" He wondered as before.

He mustered up some courage,
To open it and see,
He took a step forward, yet there was no floor.

Down, down, down and down he went!
"How much fun is this!" he exclaimed.
So back he went for more.