Use a paint pen to draw a Frankenstein face onto the glasses. Start by drawing the hair and filling it in with the paint pen. Add eyes, nose and a mouth. Add eyebrows and scars/stitches. Set aside to let dry.
Place black sugar crystals into a small shallow bowl.
Gently rim the top of the glass with corn syrup. I find that dipping my finger into the corn syrup and rubbing it around the top works best. Plunge the rim of the glass into the sugar crystals. Repeat until all glasses are rimmed and set aside.
Add ice to a cocktail shaker. Add Gatorade and Rum. The ratio is 2 shots of rum to 1 shot of Bacardi. This will fill one glass. To fill 6 glasses, you'll need about 12, 1 oz, shots of Gatorade and 6, 1 oz, shots of rum. Shake well. Top with a splash of lemon lime soda.
Pour into prepared glasses and serve immediately.