1Heat oven to 400°F. Place paper baking cups in 24 regular-size muffin cups. In medium microwavable bowl, heat water on High 1 minute. Stir in cocoa with spoon until smooth. Cool 5 minutes.
2With electric mixer, beat in remaining cupcake ingredients on low speed 2 minutes, scraping bowl constantly. Beat on medium speed 2 minutes, scraping bowl frequently. Fill muffin cups half full.
3Bake 15 to 20 minutes or until toothpick inserted in center comes out clean. Cool completely, about 30 minutes.
4Spread frosting on cupcakes. Sprinkle with pecans and candy decorations. Add gummy worms, gently pushing one end into cupcake.