Sometimes people get a checkup at the doctor's office and they're told their "heart is like a ticking time bomb", meaning they won't live much longer if they keep taking their health for granted.But what does it mean when your ears audibly tick twice a second like a metronome?If you're Sankey Flynn of Greensboro, North Carolina it means you have a strange condition that makes you a living timekeeper: According to physicians, the noise came from the "spasmodic contraction of muscles in the roof of his mou...