(once made as a tease for a woman who Hated spiders)
Take your average cake mix. Bake it up in 2 metal bowls-1 bigger than the other. Once unmolded, cut the bigger one (the "body") in half, horizontally. Carefully scoop out an adequate cavity in each half. Fill with well-whipped set green Jello, and reattach the halves. Frost black, arrange on serving platter. Use licorice stix as legs. Use 2 Big green gumdrops and 6 little ones as eyes. When the cake is cut into, it spurts green goop, just like a real spider when stepped on.
Why not add a red hourglass to the back and make it toxic? ;-)