1 lg. can pineapple juice (unsweetened)
1 can cream of coconut
1 (6 oz.) can tangerine juice (or whatever flavor is desired)
2 c. rum

Mix above ingredients with blender in Tupperware container. Freeze. Consistency remains slushy. Fill 1/2 glass with slush mixture and dilute with cream soda. Mixture may be kept in freezer indefinitely.