Is grandpa's upper body true?

Grandpa's upper body is a superstition, and there is no scientific basis to prove its authenticity.

In folklore, some people may claim that they or their families have met "grandpa's upper body", which is usually considered unscientific.

We should believe in science and rational thinking instead of blindly believing in superstition and mysterious power. If someone claims that they have encountered a similar situation, we can advise them to seek the help of a professional doctor to determine whether there is really a disease or other problems.