Tape lengths of white thread to the bats, and tie the other ends to the ring, hanging them at varying heights. Place lamp shade on lamp, and turn on the light to make your shadows appear. Draw scary designs and shapes onto a piece of paper, and photocopy, enlarging to fit around your vase. Tape the sheet of acetate around the vase. Place a tea light inside.
Secure vellum sleeve with double-sided tape, and light candle.
Scary sound effects. You needn't create an elaborate haunted house to set the mood for a spooky evening. Sometimes it takes just a few eerie sounds to convince visitors that ghosts are lurking nearby. It's easy to record your own soundtrack of frightful noises with simple items you already have at home. Slowly and firmly knock the heels of heavy, leather-soled shoes against a wooden floor.