There are many kinds of perfect. Here is just one. It's a good choice if you want a light flavor without overpowering rum or alcohol flavors. Pyrat is a high-end rum made by Patron. It's not cheap, but if used as a flavoring, will last longer than one might expect.
6 oz Coke
3/4 oz Pyrat XO Reserve Rum
3/4 oz Bacardi 151
Pour ice into cup. Fill a shot glass with half Pyrat and half Bacardi 151. Pour about 2 oz of Coke into cup. Follow with half of shot glass contents. Pour another 2 oz Coke, and empty shot glass. Add last 2 oz of Coke. Stir and garnish with cherry or lime slice, if desired.
A historical note on the bottle decoration: Karl Greenberg describes the buddha ("Hoti") on the bottle as being a "fictive patron saint". This is not accurate, since Happy Hotei is indeed the Laughing Buddha. He could well be described as the patron saint of bartenders (as well as restaurateurs and fortune tellers). Do your homework, Mr. Greenberg!