1 (50 fluid ounce) can crushed pineapple, juice reserved
1 (2 liter) can frozen limeade concentrate
2 (15 ounce) cans lemon-lime flavored carbonated beverage
1 (3.8 fluid ounce) jigger citron vodka
In a blender or a pitcher, combine pineapple, limeade concentrate, lemon-lime soda and vodka. Shake vigorously until smooth. Serve chilled.