BETRAYED BY YOUR OWN BONES! That's right, folks! Your skeleton isn't just hanging around supporting your meat suit—it's actively plotting against you! Osteocalcin, the hormone mentioned in the title, is actually secreted by your bones and can trigger fight-or-flight responses. So when you feel that inexplicable anxiety? That's your skeleton whispering "BOO!" from the inside! The ultimate biological prank—getting spooked by the very calcium framework you thought was on your side. Next time you feel shivers down your spine, remember it's just your bones practicing their Halloween routine year-round!