I would have never guessed that menial jobs would be the hardest ones to automate. I realized that humans have some incredible skills that were vital to our survival, and were honed over billions of years. But we take these skills for granted because most humans are born with these natural abilities, which are actually very impressive in the grand scheme of things. A janitor might not get paid very much relative to other jobs, but it took billions of years of evolution to hone their brain, muscles, balance, hand eye coordination, energy efficiency, information processing, etc. We're actually very impressive creatures!