1 (46 fluid ounce) can pineapple juice
1 (750 milliliter) bottle whiskey
1 (10 ounce) jar maraschino cherries with juice
1 (2 liter) bottle lemon-lime soda
Stir pineapple juice, whiskey, and maraschino cherries with their juice in a large freezer-safe container with a lid. Cover container tightly and freeze slush overnight.
Scoop the whiskey slush into old-fashioned glasses, making sure each glass contains a cherry or two. Top with lemon-lime soda.