"Scoop out the watermelon and have that with a barbecue, and then cut a hole to fit a keg shank. Fill with drink of choice (watermelon sours would be perfect, but any summery, pulp-free drink would do), et voila."
JellO-Shots....... Cut an Orange (or lemon or lime) in HALF and gut it. Mix the jello shot (1 cup hot water, box jello, 1 cup various liquors), stir till disolved, then add the jello mix to the half shell and refrig for 3 hours or more. Once solid, slice and serve!