Begin by filling a 16 oz. glass or 16 oz. plastic cup (Dixie Cup) with ice. Then fill a boston shaker halfway with ice. Add the Southern Comfort, Watermelon Liqueur, Peach Schnapps, Triple Sec, Cranberry Juice, and Sour Mix to the shaker. Shake vigorously. Then strain the contents of the shaker over your ice filled glass/cup. Fill the glass/cup the rest of the way with Sprite and give it a quick stir. Garnish with a Watermelon slice or serve with no garnish at all. Either way, enjoy!