Two black men in overalls eat watermelon slices, spitting the seeds out.
That happens to be the right way to eat watermelon, although in my household we tried to get the seeds onto a plate to be disposed on later. Eating watermelon is stereotypically associated with poor Black people because it was a cheap sweet treat that grew with little care as long as there was sunshine and water. When I was a child, you could buy them at the supermarket for as little as two cents a pounds in July and August. Even today, a small one is sold for $5.
This sort of short actuality was in almost every movie catalogue in the era. The Internet Movie Database lists half a dozen similar titles by 1903. This one is typical.