The file
A steel spring that walked down stairs, and a two-line song that has run, more or less unchanged, since 1962. It's the longest-running toy jingle in America.
Every version of the commercial shows the same thing, the Slinky on the stairs, because that's the only thing it does and it's enough. Gen X sang it; their kids sing it; the spring is the same.
Sources: Wikipedia — Slinky
