A tiny knock-and-refusal story told mostly through sound effects: thumpaty, frumpaty, stumpaty. Children tend to love repeating the nonsense words more than following the plot.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Young Roger came tapping at Dolly's window,
Thumpaty, thumpaty, thump!
He asked for admittance; she answered him "No!"
Frumpaty, frumpaty, frump!
"No, no, Roger, no! as you came you may go!"
Stumpaty, stumpaty, stump!
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition