Four lines about an old woman who lives under a hill and, so far as anyone knows, lives there still. A tiny bit of nonsense with a shrug for an ending.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
There was an old woman
Lived under a hill;
And if she's not gone,
She lives there still.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition