Fill a rocks glass 3/4 with cracked ice. Pour the Grenadine in the center--it will sink to the bottom. Shake the Almond Syrup, Triple Sec, and Lime Juice with ice and strain into glass. Over the back of a spoon, float the Dark Rum. With any luck you'll have three layers. Serve with a straw and garnish with a pineapple chunk speared to a cherry, or a spring of fresh mint and lime wedge.