Swamp Water

Fill a cocktail shaker halfway with ice.

Pour the 151-proof rum, gin, melon liqueur, pineapple juice, and lime juice into the shaker.

Shake vigorously for 10-15 seconds until the shaker is frosty and the mixture is well-chilled.

Strain the mixture into four highball glasses filled with fresh ice.

Top each glass with grenadine, pouring it slowly to create a layered effect.

Stir each drink briefly to combine and serve immediately.