Things You'll Need
Instructions
Find a light source, such as an overhead or standing lamp.
Locate a surface onto which to cast the shadow. The floor or wall will work well. You might also consider a screen or flat room divider. A panel of closed curtains will also suit your purpose.
Position yourself between the light source and the surface.
Adopt the frightening posture of your choice. You might choose to crouch, hunch your back or raise your arms as if to pounce, for example. The possibilities are endless.