Re: Cleaners...
There was a survey where they did IQ tests with random people... and found a cleaner with an IQ of 150.
They interviewed her, and it turned out her dad had taken her out of school at 14 to make money, so she had no education whatsoever, and all her life she had the feeling that people around her couldn’t think properly.
So thinking you are more clever than the cleaner can be quite wrong.