From an NPR story on Peruvian potatoes:
Arbizu holds up a potato that looks like a bunch of fat purple grapes glued tightly together. A wife-to-be has to pass a test.
“The lady has to show her future parents-in-law that she will be a wife dedicated to her family by peeling successfully this potato,” he says. “It is very difficult to peel it.”
Read/listen/view the whole story. If you want to see a picture of the potato upon which your whole future life could hinge, click on the audio slideshow and fast forward to the 11th picture.