You get a Russian doll
You open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
Then you open it up
And there's another one
And when you think they've all been found
There's another one!

Pickled Onion

http://www.poemhunter.com/poem/russian-doll/