Blessed are the people with whom we can let down our hair, who will walk with us in conversation or silence, who will take our hand and swing it cheerfully between us as we go.
Who can you let down your hair with?
Sure, you could use a washboard to wash your clothes, but those of us with access to washing machines generally find them a whole lot easier to use. But nothing sounds quite like a washboard, when you play it with a guitar pick or drum brushes. How useful something is often depends on how you define its usefulness.
What do you like to use in some way other than what it was designed for?