Answer:
What has to be broken before it can be used?
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Metal or bone I may be, many teeth I have and always bared. Yet my bite harms no one. And ladies delight in my touch.
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
My teeth are sharp, my back is straight, to cut things up it is my fate.
If lightning strikes an orchestra who is the one most likely to get hit?