The Extreme Hanky by Sean Bogunia.

Imagine the excitement when you hand the bottle to a child and see the expression on their face as they control the actions of the hanky in the bottle! Never before has there been such a powerful jaw-dropping Dancing Hank effect that allows you to actually join your audience as they participate in this amazing routine! Now you can get off the stage and bring the fun directly to your audience. Stop performing for them and start performing with them!