The sternum, or breastbone, is the flat bone where the ribs meet. Sometimes, the joints can pop or crack as a person stretches or moves. A muscle spasm, an injury, costochondritis, and surgery are ...

"He would just go through your chest. He hit me in my sternum one time, I couldn't laugh for a week. It hurts to laugh, all them jokes were no longer funny," Haywood added. Related: Barkley ...