These awesome shakes are unique for the graham cracker crumbs in the mix that make them taste as if you're slurping up a creamy chilled pie, crust and all. Delicious! You can either crumble up your own graham crackers or use the already ground stuff in a box that's used most often to make graham cracker pie crusts. If you place all the cups that Sonic uses in a year for these shakes and other beverages end to end, they would circle the earth twice. that's including the detour the cups would make to avoid passing through Detroit.