Melt the butter in a medium saucepan. Add the marshmallows and stir until completely melted. Remove from heat. Add Rice Krispies and stir until they are coated with gooey stuff.
Lay out two fruit roll-ups on a cutting board, spread 1 cup of the Rice Krispie treats onto each of the roll-ups. Place two gummy worms in the center of each roll, then roll up each one tightly. Use a serrated knife to cut them into rolls. Eat! And use chopsticks!!