Use a pencil to draw a silhouette of a scary figure on your cardboard, think of someone holding a knife or an axe. Keep the design tall and proportionate (around 3 feet high) for a dramatic effect.
Carefully cut along the outline with your utility knife. Take your time around narrow areas like arms or tools for a clean cut.
Tape an extra layer of cardboard behind the cutout for added thickness, especially if you live in a windy area.
Tape or glue the wooden stakes to the back, about 6 inches apart, so the cutout can stand firmly in gravel or soil.
Spray the front and sides with matte black paint to eliminate reflections and make the shadow more defined. Let it dry completely.
Place the figure 3-5 feet in front of a light-colored wall or fence. Position the spotlight at a low angle, pointing upward to cast a large shadow.
Move the light closer or farther until the shadow stretches dramatically across your wall.
