I keep losing my train of thought

I really would like to find it,
but sometimes I'm afraid I don't even have the ticket

I lost my train of thought

So I decided to go looking

When I found it, it was derailed off its tracks

Wrecked completely, in flaming chunks

I found pieces of it hanging from a cliff

Other pieces somewhere in the depths of the ocean

And yet more pieces,
Still on their track and chugging to their doom

I lost my train of thought,
maybe it's best I didn't have my ticket