A hide-and-seek rhyme dressed up as an alphabet lesson, with a cat hiding in the cupboard for good measure. Short, bouncy, and over almost as soon as it starts.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Great A, little a,
Bouncing B!
The cat's in the cupboard,
And can't see me.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition