How can a shoe fit one day and be too small the next?  I walked 10.8 miles at the canal today and discovered that my right shoe has mysteriously shrunk.  My toes were cramped the entire way.  (And no, I wasn't wearing different socks.)  Whatever the cause of my sudden shoe shrinkage/foot growth, I now urgently need new shoes -- which means braving the post-Thanksgiving shopping crowds.  Uggh.