This was probably my second favorite cake as a child. (Nothing tops my mom's chocolate ice cream cake with chocolate ice cream and chocolate fudge sauce.)
1 large box instant chocolate pudding
8 oz. cool whip
1 lb. package Oreo cookies, crushed
Prepare pudding according to package instructions. Fold in cool whip, and stir in some of the Oreo cookies. Top cake with cookie crumbs. Add gummy worms if desired.
Note: This is best presented in a clean flower pot.