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1. test dummy
2. fake head (we used styrofoam)
4. liquid latex (preferably in a skin color)
5. garden sprayer
7. 6 bottles of food coloring
Step 1: The Head
Make some fake skin out of some foam and liquid latex (we used a skin color). Attach this piece to the top of the neck, make sure it measures up to fit into the head (but do not connect them).
Cut out a hole through the neck, for the fake blood to come through.
Cover the rest of the head and neck with more of the liquid latex, to make it look like skin.
Next cover the inside of the neck and the head (where the two will be separated) with red paint.
Then using some basic make up and some plastic eyes, give the head more detail
Step 2: The Blood
Mix it up, and you've got a ton of blood.
Step 3: The Set Up
Put the nozzle and tube up through the clothed test dummy. Attach the neck piece, so that the balloon is on top. Then put on the head on and make sure the balloon is inside the cavity you dug out of it.
Then, pump the garden sprayer, and the balloon should inflate with the fake blood. When you decapitate the head, the balloon will explode and fake blood should fly everywhere.