What is foil on the doorknob?

Foil on a doorknob is a trick used to prevent static electricity build-up on the doorknob. The idea is that the foil will conduct the static electricity away from your body and into the ground, preventing any shock or discomfort that can occur when you touch a doorknob. To use this trick, one should wrap a small piece of foil around the doorknob, ensuring that it makes a good contact with the metal. However, it is to be noted that foil on a doorknob is not an effective solution for preventing the spread of germs or viruses. Therefore, it is essential to practice good hygiene habits, such as washing hands regularly, to protect oneself and others.