I don't know why, but mixed this way it just tastes like a darn bomb pop (think three colored popsicle from your childhood). Great on a hot day though.

Smirnoff red,white, and berry vodka
lime juice
ginger beer (I prefer Goslings or Bundaberg, last resort Barritts stay away from Reeds in mixed drinks IMHO)
ice

1-2oz* red, white, and berry vodka *you really can't overload it, so put as much as you want
juice of 1 lime or lime wedges muddled
6-7oz ginger beer
ice

serve in a copper mug like other mules.... very nice.