Grab a small pot and pour about half of the bottle of Kahlua rum (or any rum of your choice) into the pot, and let it simmer for about a minute. Eyeball enough raisins to toss into the rum, and then add in the 1/4 c of sugar. Stir until the sugar dissolves, and let the rum raisins simmer for about 3 minutes.
Allow the rum raisins to cool off before mixing it in with the ice cream. Once raisins are fully cooled, scoop as much ice cream as you desire and stir in the rum raisins. You can eat right away or put it back in the freezer till the next day. It'll be delicious both ways!