It is proof of the stupidity of humans, they are praying to a potato ... a potato. If there really were an all powerful deity that could do anything why the hell would he put these signs in random cheese sandwiches, vegetables, and other seemingly daft places.
If it is a god he must be laughing his metaphysical arse off, he's some sort of cosmic practical joker.
And in related Pareidolia news http://www.wlbz2.com/news/watercooler/article.aspx?storyid=86461