1. Styrofoam head.
(Many different websites sell these, but the cheapest I found were at www.valuedisplay.com )
2. Flesh colored spray paint.
(They don't actually make a "fleshtone" spray paint, so just get the one that looks closest to your actor's skin tone.)
3. Make-up kit
(Don't you people get it yet? Buy a simple make-up kit with some different flesh tones and reds.)
4. A wig.
(The foam heads come bald, So unless your actor is bald you'll need a wig.)
5. Glasses, mustaches, etc.
(Distinctive items like this that can be worn by both your actor and dummy head will help to fool the viewer.)
6. Fake blood.
(No matter which way you end up "offing" this poor dummy head. You'll probably want some fake blood on hand. Mix Corn syrup, red food coloring and a splash of chocolate syrup for yummy blood.)
7. Liquid Latex.
(To add some "fleshyness" to the face.)
Step 1: Creation of the Heads
Step 2: Destruction of the Heads (Part 1)
In this empty space I stuffed a freezer bag full of fake blood, then taped it into place. All someone has to do is puntcure the head and the bag and blood will gush out.
Next I installed the blood shooters from a previous episode into one of the heads. This was a similar process, but instead of of cutting a section out I cut the head in half. Then just tapes in the blood shooter nozzle to line up with a small hole I put in the forehead of the dummy.
Step 3: Destruction of the Heads (Part 2)
Next I whipped up some DIY ballistics gel. We are going to do a special "Weekend Extra" on how to make this, but basically it's just water and Knox gelatin with a higher ratio of powder to water then usual. So I poured the "brain gel" in the empty head about half way. Then I lowered a glass into the center and taped it into place. When the gel hardens I can pull this glass out and we will have a perfect little pocket to fill with fake blood. Don't forget to spray the glass with cooking spray so you can get it out.
Now that your heads are prepped for destruction you can get to the filming. Remember to have extra sets of glasses and mustaches around, since some will probably get destroyed along with your heads. The key to making this look cool in the end is editing. Fool the viewer by showing the real actor right before and right after you inflict mayhem on your dummy head.