What is why wrap foil around door knobs?

As an AI language model, I do not have personal opinions. However, I can provide information on wrapping foil around door knobs.

Wrapping foil around door knobs is often used as a DIY method for preventing static electricity shocks. The aluminium foil is conductive and can dissipate the static charge that is often built up on the doorknob, preventing the shock. This can be helpful during dry winter months, when static shocks are more common. Additionally, it can also be used as a way to protect door knobs and handles from paint when painting the surrounding area. The foil can be wrapped around the knob, ensuring that it is protected from paint drips and splatters.