If Pat O’Brien’s invented the Hurricane, Tropical Isle invented the Hand Grenade — a neon-green, deceptively potent blend of rum, vodka, gin, melon liqueur, and their secret proprietary mix that has been sending Bourbon Street revelers sideways since 1984. The original location at 721 Bourbon Street is the one, though multiple outposts have proliferated across the French Quarter. The Hand Grenade — served in a distinctive green plastic grenade-shaped cup — is the most recognizable drink vessel in New Orleans and has its own trademark. The rule is simple: one Hand Grenade and you’re having fun. Two and you’re having a great time. Three and someone else is making the decisions.