Bake cake according to package directions.
Let cool, and then frost with chocolate frosting.
To make spider, take 8 brown chenille pipe cleaners (the fuzzy ones), and bend into leg shapes, poking them into the spider's body. (Four on each side).
Use the "googly" eyes to put on the face of the spider, and to make him really scary, I use fangs with just a bit of red icing on them to make it look as if the spider has bitten someone.
When you cut into the cake, the red (strawberry) insides look like you're actually cutting into a spider's body.
Really simple, fun, and great for kid's Halloween parties at school. Serves a lot of kids!