Investors need to be on high alert for a possible major breakdown in shares of Wal-Mart Stores, Inc. (NYSE:WMT). There is a bearish head and shoulder pattern formation on the stock chart. The retailer is hammering on a trend line (part of the head and shoulder pattern), that if broken, will yield a collapse on the stock to $59. This is not a small move, the stock is currently above $68. This is a 13% potential drop that could play out in weeks to a month or two. It definitely deserves attention from investors and traders.