One of the best-known Mother Goose rhymes: Peter can't keep his wife, so he puts her in a pumpkin shell and keeps her there instead. The image is pure nonsense rather than anything to take literally, and its odd logic has kept children reciting it for generations.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Peter, Peter, pumpkin-eater,
Had a wife and couldn't keep her;
He put her in a pumpkin shell,
And there he kept her very well.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition