Not your grandmother&#x27;s melon balls! These Spiked Watermelon Balls pack a punch of rum and a twist of lime. Keep your cool this summer and remember to share! This recipe is perhaps simplest and easiest to do yourself, or delegate. There are many types of melon ballers that give different shapes, so experiment in the kitchen and drench in a curtain of summer rum for adult fun! See all watermelon recipes.