A tiny four-line rhyme built almost entirely around its own rhythm and the fun of the name Robin-a-Bobbin. The archer's aim goes wrong in the last line, which is the joke, though it does mean a crow ends up shot.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Robin-a-Bobbin
Bent his bow,
Shot at a pigeon,
And killed a crow.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition