Years ago I was home and had my truck at the local Cat House. The shop boss called me and says when I get a chance, to come down. The mechanic had crawled under the truck and noticed a bad starter cable. After they got it off it was apparent it could have become a dead short at any time. I was surprised it even made it into the shop. That was a good mechanic to notice it up between the frame and the starter. I had not noticed it and I did most of my own maintenance and prided myself on catching things before failure.
That's when I started carrying large set of bolt cutters.