Bump Bump Bumpety Bump

Well, once upon a time
I was climbing
On top of a rock
and then--
Bump!
And then
I climbed off.
But suddenly
I knew there was
Something
Under it and I peeked under it.
Nothing
Was there.
So, again I climbed on top of it.
And suddenly again--
Bump!
I climbed off and
Looked on top of the rock
And I saw that there was a
Sea turtle
On the top
And it was jumping!