For instant service: Put the vodka and flavored liquor into a cocktail shaker with ice, then shake for 10 seconds or until cold. Pour into shot glasses, then top with lemon lime soda. Serve right away.
For pre-mixed batches: Mix together 1 cup of vodka with 1/4 cup flavored liquor and 1/4 cup lemon-lime soda (you can use more if serving by the glass). Pour into beverage container and chill until your party.