The Incredible Shrinking Grapefruit.

If you buy a grapefruit and leave it in a dry place for several weeks, it will shrink. I have no proof of this phenomenon, but I have had many analogous experiences with oranges and other citrus fruits.

Shrunken grapefruits are characterized by an extremely tough, shell-like peel. It is almost impossible to break through the peel, because it has toughened so much over time.

If you do find a way to open a shrunken grapefruit, you will be disappointed with what you discover. Shrunken grapefruits are almost completely dried out, making them inedible to all but the toughest fruit survivors.