What is foil on doorknob?

Foil on a doorknob is a simple DIY method to prevent static shock from door handles. It involves wrapping a small piece of aluminum foil around the doorknob, thus creating a barrier between the user's hand and the metal surface. This trick is particularly helpful during dry winter months when the air is dry and static electricity is more likely to build up. Adding foil to doorknobs is inexpensive, easy to do, and requires only a few minutes. It's a quick fix for anyone worried about getting an unpleasant electrical shock when opening doors in their home or office.