I don't know, and I'm not about to try. But it isn't just finger knuckles that crack – you can do it with your neck, back, knees, ankles and toes.

我不知道，我也不会试。但是并不是只有指关节可以可以被掰响，你的颈部、背部、膝盖、脚踝和脚趾的关节都可以。