This is the largest thing I've ever grown. And I can't even really take credit for it.
Micah planted some Crimson Sweet watermelon seeds in the spring, and I honestly didn't think anything would come of them. Watermelon just seemed to big for us to successfully grow!, I don't know why. But, vines sprouted, and snaked through the monkey grass... flowered... and started putting out tiny watermelon babies. We planted them where a wood pile used to be, and I think they were getting some primo organic matter.
When I realized it was October (and saw the stem was drying up), I thought it might be time to pick. We ended up harvesting two; this one was the largest. They were both sweet and juicy and actual real-life watermelons, that we grew, somehow.