If GH stands for P as in Hiccough
OUGH stands for O as in Dough
PHTH stands for T as in Phthisis
EIGH stands for A as in Neighbour
TTE stands for T as in Gazette
EAU stands for O as in Plateau
Then the correctg way to spell POTATO would be GHOUGHPHTHEIGHTTEEAU.

(I don’t know where this came from originally, but thanks to +Włodzimierz Sobkowiak for reminding me of it.)