Longing for Watermelons of Old

What ever happened to seeds in watermelons? I have enjoyed my fair share of watermelons this summer since it is one way to make it feel like summer without having the summer heat here in SF. The only watermelons I can find are seedless. While these are nice and convenient I miss the childhood fun of spitting seeds, especially the idea of me doing it out of my third floor apartment window. I am not sold on those 'personal' watermelons either. The beauty of a watermelon is lugging this huge melon home pondering how it is humanly possible to eat the whole thing and joy of sharing. And what happened? Watermelons used to be oblong, now they seem to be more round.