3/4 oz Orange Liqueur (Cointreau, Grand Marnier, etc.)
3/4 oz Vodka (Absolut Mandarin)
8 oz Energy Drink (Red Bull, Gatorade, Monster, Rockstar, etc.)

Fill a shot glass half with triple sec, half mandarin vodka, then set into a pint glass half-filled with Rockstar energy drink, and serve. The shot-glass sits in your glass while drinking. This really does taste like cactus cooler.

Thanks, Watsons