Squeeze the 2 grapefruits into a large jar, or Tupperware, or glass measuring cup - really any large container. Add equal parts of vodka (to tequila or gin, pick your poison). It will be about 1 cup of liquid each of juice and liquor. Add the juice of 1 lemon & 1 lime. Stir it all up.

Fill a tall glass with ice, and fill them 3/4 full of the grapefruit vodka concoction you just made. Fill the remaining 1/4 of the cup with ginger beer. Stir again and ENJOY!