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Preheat oven to 375 degrees F.
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In the bowl of a food processor or blender, process the graham crackers and Oreos to make crumbs.
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In a bowl mix together the cookie crumbs, sugar and butter with your hands. Press the mixture evenly into a 9-inch pie pan. (It will seem like an excessive amount of crumbs, but it will compress down quite a bit with pressure.) Cover the crust with plastic wrap and top with another 9-inch pan, pressing quite firmly to make a smooth surface. Bake the crust for 15 minutes.
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Remove the crust from the oven and let cool completely before filling.