Never break a girl's/boy's/someone's heart. They only have one of them.
Break their bones instead. They have 206 of them.
Heart vs. Bones
Categories
Explanation
Experiment
The joke plays on the contrast between the fragility of the heart and the relative abundance of bones in the human body. It uses morbid humor by suggesting physical harm as an alternative to emotional hurt. It's funny because it's unexpectedly dark and absurd.