What is why wrap your door handle in foil when alone?

There is a popular belief that wrapping your door handle in foil when alone can alert you to the presence of an intruder. The idea is that if someone tries to turn the handle, the foil will make a loud noise and you will be alerted to the presence of the intruder.

However, there is no scientific evidence to support this claim, and it is not a recommended method for home security. If you are concerned about intruders, it is better to invest in a good quality deadbolt lock, a security system, and other home security measures.