Since August 2007, nine DISEMBODIED HUMAN FEET have washed up on the shores of British Columbia and Washington.
The feet belong to five men, a woman, and one other person (two of the left feet have been matched with two of the right). The source of these feet is yet unknown, and the strangest part of the mystery is that the rest of their body parts have not been found!
More on this bizarre mystery can be found in this news article. It even has a Wikipedia entry.