Prep: 5 mins
| Cook: 6 mins
| Extra time: 1 hour, marinating
Take a shot of rum.
In a gallon-sized zip-top bag, combine rum, lime juice, pepper and sugar. Seal and shake until the sugar has dissolved.
Put shrimp in the marinade, and mix to evenly coat. Press all of the air out of the bag, and seal. Marinate in the refrigerator 1 hour to 1 1/2 hours. No more than 1 1/2 hours max or the lime juice and rum will start to cook the shrimp!
Preheat grill to medium-high. Thread the shell-on shrimp onto the soaked skewers, about 5 per skewer.
Cook the shrimp skewers on the preheated grill 3 to 4 minutes per side until the shells turn pink and the center of the shrimp is no longer translucent.