Here's my recipe:
3/4 oz. Tequila
3/4 oz. Vodka
1/2 oz. Coffee Liqueur (Kalhua!)
4 oz. Light Cream or Milk
2 oz. Cola
Plenty of ice (ice baby)
First, pour in the coffee liqueur, follow that with the tequila and vodka; next, throw in the cola — don't use Pepsi, you sick bastard — and finally, top the drink off while slowly pouring in the light cream or milk, but only stir the top layer or it will not work.
You can put it in a shaker if you want, but that'll kill the layered effect — dealer's choice.