Crumple up one piece of tissue into a ball. Notice the concentration on Ella's face:
Put it in the middle of another tissue, and fold that tissue up around the ball.
Cut a long piece of string and tie it around the tissue to hold the ball in place. Leave one end of the string long so you can hang your ghost:
Use the marker to draw a face on your ghost like this:
Or like this:
And make the "Boooooooooo!" sound:
Swing your ghost around and knock your sibling in the head a few times: