Remember this song... "you can't eat chips in the rain, no matter how hard you try..." - forgot the title, anyway. How about creating waterproof (or at least water-resistant) potato chips? It would also help solve one of the other unsolved challenges of mankind, namely how to safely eat chips in the bathtub. Currently it's high-risk business - the slightest slip of the hand, and those chips are toast (or mush more precisely).
The coating (preferrably something edible, not teflon) could also add to the texture of the chip (e.g. make it more crunchy), so you could kill two birds with a stone.