Shrinking and Growing Head Illusion (Plastic) [SHRINKGROWHEAD_plastic]
Just wanted to add that this effect, although not magic, is so powerful that I often use it as a closer for my performance. Audiences love it! You can hear and see them gasp and laugh! Comes complete, and I've used it with great success for up to 150 people, where they were 20 to 100 feet away.