Were you leaning close to the machine when it broke? Any chance it flew up into your hair or (scary thought) you inhaled it?
Just in case anyone thinks this is impossible to do without knowing about it, I recently read an article about a teenaged boy who underwent heart surgery and the doctors found a pin he had unknowingly inhaled. It seems he likes to tailor his own clothes, had several pins in his mouth, inhaled one and they think it traveled to his heart. Yet another example of what not to do.