Like many great ideas gone awry, D.C.’s Watermelon House was something of a happy accident. The owners decided to liven up their house by painting it a bright red color. The front of the house looked great with the new eye-catching hue, but the side took on a pinkish hue that resembled a certain famously pink stomach medication. Instead of repainting, the owners of the home used the pink sidewall as the basis for a watermelon mural that became an instant favorite with locals, and quickly spread on social media…