While there is nothing shameful about baldness, try to guess the four U.S. Presidents who would traditionally be considered bald.
Most presidents experienced some amount of hair loss during their lives, so only the ones who visibly had almost no hair on the top of their heads while president are included.
I know that James Garfield and Gerald Ford had significant balding as well, but they still had visibly thicker portions of hair on the top of their heads, so they are not included.