I have no idea if this is what you're looking for, but it popped into my head pretty much at once (line breaks and punctuation may be off, as this is from memory):

I went searching for the pot of gold
That's waiting where the rainbow ends
I searched and searched and searched and searched
And searched and searched and then
There it was, deep in the grass
Under an old and trusty bough
It's mine, it's mine, it's mine at last
What do I search for now?
-Shel Silverstein