Two-Faced Pumpkin with Wall Projection
In case its startling greeting didn't scare you, this pumpkin also projects a leering visage onto the wall behind it.
Cut a hole in the bottom of the pumpkin and scoop out the insides, hollowing until the flesh is 1/2 inch thick.
Photocopy face and BOO! templates to desired size; cut out. Tape templates to opposite sides of a large pumpkin, and trace shapes by poking holes with an awl; remove templates.
Use a narrow linoleum cutter to carve greeting, scraping off pumpkin skin. Cut out facial features with a miniature saw.
After carving the front and back of the pumpkin, position it near a wall; you may need to experiment with the placement to get the right ghostly effect.