like gster said, use shatter, it'll break your skull into pieces and i'm pretty sure they get turned into active rigid bodies, so they will fall once you move the pieces slightly.
you can also turn the foot into a passive rigidbody and that should move the pieces around.
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D