Answer:
What has a head and a tail but no body?
What is something that can go up quite easily, but is not as easy to bring back down?
What is something you can give away as many times you want without ever losing it?
One might hang a locket from this
Hearing something unexpected or touching a live wire can have this effect.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.