4. Place your sour cream in the end of a ziploc bag. Cut the corner off. Squeeze sour cream on top of guacamole in several concentric circles (or octagon shapes for a more authentic look). Using a knife or the handle of a fork, run lines lightly through the sour cream to make the web shape.
5. Sprinkle lettuce in a circle around bean dip. Sprinkle tomatoes and green onions over. Sprinkle cheese over.
6. Garnish with a creepy spider and serve with lots of tortilla chips!