Hard boil all 12 eggs. Cool them off. Cut them in half lengthwise. Scoop out the yolks. Set the whites aside (if you have a snazzy deviled egg platter like me, put them on that hehe). Mash the yolks in a bowl with a fork. Stir mayo, mustard, salt and pepper into yolks so it's nice and smooth. Fill the whites with the yolk mix. Take the bell pepper and cut out 48 little red triangles and insert them for horns. Cover and refrigerate up to 24 hours. Before serving, sprinkle them with a bit of paprika. Voila! Evil eggs!