Zombie. 

Makes about 15 8-oz servings. 

600 ml light rum
600 ml dark rum
300 ml Bacardi 151
300 ml triple sec 
250 ml lime juice (unsweetened)
300 ml orange juice
300 ml guava juice
300 ml pineapple juice
150 ml grenadine
300 ml sugar syrup*
20 ml Anisette

* sugar syrup: two parts sugar to one part water.
Alternate for a slightly bigger punch: 
  150 ml almond syrup (orgeat)
  150 ml sugar syrup
  100 ml Anisette

Mix well and serve over ice. Some people use Pernod instead of Anisette,
but Anisette is cheaper. If you use Pernod, adjust the sugar to taste. If
the drink is too sweet, but you don't want more Anisette, add a tbsp of
cheap vodka for the perfect whack-on-the-head zombie taste.

There's a whole lot of alcohol in this. It's about 35 proof, but it
doesn't feel like it. This is not a drink for novices. 

The cost of producing this is around $40 for slightly less than a gallon.
You also need the guava juice and the Anisette, which are expensive and
rarely used. An 8oz drink will cost around $3 in raw materials. So, for
our Halloween party, we spend $200, half of our drink budget, to make
four gallons of these.