Bit-o-Honey goes a long, long, long way.
If you have one head,
it'll last all day!

This jingle appeared at the end of an animated Bit-o-Honey commercial - it featured a many-headed monster of some sort, who was placated by being given a Bit-o-Honey bar. Bit-o-Honey bars, as I recall, were scored in a way that allowed one to break off several bite-sized pieces.

As I recall.

Don