Updated: May 4, 2019
Rum Runners come in many different varieties and they are not created equal. This frozen version is a summer fav.
Fill blender with 3 cups ice. 4 oz of cream of coconut. 2 oz rum. Add dashes of coconut rum, banana liqueur, blackberry liqueur, and amaretto. Finish with a splash of grenadine. Blend up and pour into Sea Cups tumblers to keep it frozen. Here's the magic: Bend that Sea Cups straw upwards and fill it with 151 rum.
After that first sip, uncross your eyes and continue to sip at just the right pace to avoid brain freezes and falling off the boat