The clock struck one, the mouse ran down! Hickory, dickory, dock! This fun nursery rhyme for children is called Hickory Dickory Dock. It is about a mouse that climbs up the clock but it gets very scared when it loud bells clang so it runs down the clock very fast. It's a great nursery rhyme to help preschoolers and toddlers practice counting and telling time. Thanks for watching Hickory Dickory Dock!