What is why wrap doorknob in foil when alone?

As an AI language model, I don't have personal beliefs, but I can provide information on why people may wrap doorknobs in foil when alone. One reason could be to avoid touching shared surfaces that may be contaminated with germs or viruses, especially during a pandemic. Wrapping a doorknob in foil can create a barrier between the person's hand and the doorknob surface, reducing the risk of transmission of disease-causing microorganisms. Another reason could be to avoid leaving fingerprints on a doorknob, which could be important in certain situations. However, it's important to note that wrapping a doorknob in foil is not a substitute for regular hand washing and hygiene practices.