I ask this question because I swear they do not live on planet earth.
My recent experience of plumbers during our bathroom renovations has led me to conclude they live on another planet because they never respond to communication...they are unable to communicate in earth talk even when you do manage to get through to them...and finding their way to your home is impossible for them, even with an inter-galactic time machine.
Here we are, four weeks later, still waiting for a plumber to give us a quote and actually turn up to do the work.
So when you find out where in the universe Planet Plumber is situated and work out how to communicate with the planet's inhabitants, please beam me up....Scotty!
Image: 'jump spaceman, jump!'