Start out by filling your rocks glass with ice.
Using your jigger, measure .75 oz spiced rum. Then, dump it into the glass.
Using your jigger, measure .75 oz white rum. Then, dump it into the glass.
Using your jigger, measure .5 oz blue curacao. Then, dump it into the glass.
Using your jigger, measure 1.5 oz sour mix. Then, dump it into the glass.
If desired, use a bar spoon to give the drink a few stirs.
Take the bar spoon and put around 5 drops of grenadine in it, then slowly drip the grenadine from the spoon over the top of the drink.