Weird Watermelon Shapes . Watermelons can help prevent cancer. Since the advent of the cube watermelon, other watermelon shapes have been introduced, such as hearts and pyramids. "A Triangle Shaped Watermelon" Mildly Interesting from mildlyinteresting-blog.blogspot.com Good luck stacking these things! It can be found across southeast asia. Watermelons are a great source of lycopene, an antioxidant that’s been shown to reduce the risk of several types of cancers, including prostate, lung, and.