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Combine sugar, evaporated milk, cocoa and cornstarch in saucepan.
Bring to a boil.
Cook until sugar is dissolved and mixture is thick (about 3 minutes) stirring frequently.
Remove from heat; stir in Kahlua and cool.
Combine slices bananas with lemon juice and set aside.
Combine chocolate mixture and cake in a large bowl; stir in chopped candy bars, reserving 1 Tablespoon for topping and set aside.
Beat 3 cups milk and pudding mix at medium speed until well blended.
Stir in cake mixture.
Cover; chill 15 minutes.
Spoon half of cake mixture into trifle dish or bowl.
Arrange 1 cup of bananas evenly over cake mixture; top with half of whipped topping.
Repeat layers; ending with whipped topping.
Sprinkle with reserved 1 Tablespoon chopped candy bars.
Chill one hour.