In a medium bowl or large (4-cup) measuring cup with a spout, heat 1 cup of Coke until boiling or nearly boiling.
Sprinkle jello powder into the hot liquid and whisk until completely dissolved. Mixture may bubble a little.
Stir in remaining 1½ cup of cold Coke and the rum.
Pour into plastic shot glasses.
Transfer jello shots to the refrigerator and chill for 4 hours until set.
Just before serving, top each jello shot with a maraschino cherry.
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Notes
Storage:Store ungarnished jello shots in the refrigerator for up to 1 week covered. Notes:To make a stronger shot, use up to 1 ½ cups of alcohol.Use more cold water or Coke and less alcohol for a lighter shot. You just need 4 cups of liquid total. These will melt in the summer heat, so keep them cold until serving time.Shallower shot glasses and icy cold liquids will make these set up faster. For a layered look: Combine 1 cup boiling water with half of the package of jello. Stir until dissolved. Mix in ½ cup cold water and ½ cup rum. Pour into cups and chill until set. Combine remaining jello mixture with 1 cup hot Coke until dissolved. Stir in ½ cup rum and ½ cup more Coke. Bring to room temperature. Pour over the set cherry jello layers. Chill until set.For a mostly sugar free version use diet Coke and sugar-free jello. Note that it will not be completely sugar free because the rum has sugar in it.