1 (1.5 fluid ounce) jigger citron vodka.
1/2 fluid ounce Blue Curacao.
2 fluid ounces sour mix.
1 (12 fluid ounce) can or bottle lemon-lime flavored carbonated beverage.
1 lemon - cut into wedges, for garnish.
Fill a Collins glass with ice. Pour in vodka, blue curacao and sour mix. Fill to the top with lemon-lime soda. Garnish with lemon wedge, and serve with straw.