Crush 1/2 of Oreo cookies (the "rocks"). Mix into pudding mixture (the "mud"). Spoon into pie crust (you WILL have extra - I usually just let the kids & fiance eat it while they wait on the pie to set, but you could probably make a 2nd pie out of it).
Divide remaining 1/2 of Oreos by half. Crush 1/2 (1/4 of package) and leave the rest whole.
Decorate pie with whole cookies (the "big rocks") and gummy worms. Sprinkle with remaining crushed cookies (the "dirt"). TIP: Saturate whole cookies with chocolate syrup if you want them to be soft for serving.
Refridgerate about 4 hours, or cover and freeze before serving.