Years ago I went to night classes to an electrical course given my by an electrical inspector for the area. The course was given so a home owner could wire his new house in accordance with the electrical regulations. I later went into some fairly advanced courses in radio, but have never forgotten that original course by the electrical inspector. He would point out how many people were killed every year by 110 volt electricity, then state that every one of those deaths would not have happened, if the safety precautions in his course had been followed. The words "ground it" were virtually ringing in our ears at the end of a lecture.
And the deaths by 110 volt electricity are still happening, from the same mistakes! On this very thread is a post that would result in death by 110 volt electric current, if carried out. Someone wrote, I think it was in this thread, that a person could be on a wet basement floor, contact 110 volts ac with his upper body, but be safe if he/she had on a pair of rubber soled shoes.
This is absolute hog wash, the person would be dead, and here is why. It's called capacitance and it allows ac current to flow through non electrical material, in particular rubber shoes. You can google electrical capacitance to see why this happens.
Electrical regulations has made your house about as electrically safe as it is possible to be. Remember, every large piece of metallic equipment in your house, like appliances, furnace duct work, etc., is already grounded. If you add larger pieces of metallic equipment of any type, say a loading press, to your work place, be sure and ground it.