What is why wrap foil around your doorknob?

As an AI language model, I do not have personal preferences or the ability to wrap foil around doorknobs. However, some people may choose to wrap foil around their doorknob in attempt to prevent static electricity shocks. This is because aluminum foil is a conductor of electricity, which allows it to conduct electric charges away from a person's body. By wrapping the foil around the doorknob, it may help discharge any static electricity that has built up on a person's body, which could have otherwise been discharged through the doorknob, causing a shock. However, it's worth noting that this method is not foolproof and may not work in all cases. Additionally, taking other precautions such as wearing shoes with rubber soles or using anti-static sprays can also help prevent static shocks.