Sarah uses static electricity

Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!

After trying to keep the balloon in place through various methods, like waving her hands over and under the balloon and later a leaf blower inside the shed, Sarah moved inside the house where she used static electricity by rubbing the balloon against her hair. She took 21 minutes and 18 seconds, receiving 3 points.

(Written by Taskmaster Wiki contributors)