Curb feelers, or "curb ticklers" were once a very popular aftermarket accessory that clamped onto the the lower right side front and rear of the rocker panel of passenger cars.
It is a well known fact for those of us that have made it in life passed middle age that tomorrow is not guaranteed and the end can come at any given moment, so we plan for tomorrow and live for today.
Now I'm remembering the early days of my youth when Revell instruction sheets had tables listing the names of all the car parts, which was the inception of my automotive education.