My grand-dad was a maintenance electrician at a large factory in Indianapolis, and sometimes on Saturdays (when he could sneak me in) I got to go with him and watch and hand tools to him. He told me my family watched one time (from a distance) as I climbed up on the kitchen table to stick a skeleton key into a receptacle there. It knocked me off the table, and before my folks realized what I was doing, I climbed back up and did it again. Grand-dad said I was "practicin". I was probably two at the time.
I got into the apprenticeship right out of high school, and ten years ago I received my Master's License.