if you eat moogle pie while ur doing the mog-kupo nut-flying game at the gold saucer for the 50th time, and you have to feed the moogle a kupo nut, his stomach will growl and see that ur eating moogle pie, and he'll jump out the screen, take ur pie, go back in and share it with his lover, mag. then he says, "oh my god... it was called MOOGLE PIE because it was made from MOOGLE LIVER! EWWWWWW!!!!!! and then both mog and mag EXPLODE into chunks of moogle bits. you can take those moogle bits then bring them to the round island and then feed it to the kotr gods and they'll give you the special super-mega-ressurect pie. (not materia) then you can throw the pie into the lil pond that aeris is and she'll smell the dilicious kotr-ness of it and suddenly awaken and then you can chop her up to create aeris pie which you feed to sephiroth right at the very very end battle when you fight him 1v1 and you can give him the aeris pie instead of doing omnislash and he'll call off meteor and everybody becomes friends. hooray.