Gottfried Hofmann writes:
Halloween is coming up and BlenderDiplom celebrates with two tutorials on scary subjects: Morphing sculpted meshes using shape keys and animation nodes.
Video of the effect:
Part 1 - Morphing sculpted meshes using shape keys
http://www.blenderdiplom.com/en/tutorials/631-tutorial-shape-key-morph.html
Part 2 - Target tracking using Animation Nodes
http://www.blenderdiplom.com/en/tutorials/633-animation-nodes-target-tracking.html