Costco Wholesale Corporation (NASDAQ:COST) was upgraded yesterday. Mind you, this came after a run in the stock from $154 to $188. For some reason, an analyst thought it was the right time to upgrade Costco after a huge run like this (I don't get it). Anyways, the stock opened higher and then sold off. The reason for the reversal was because the stock slammed into a great resistance trend line (as seen in the chart below). This triggered my short. This is a no-brainer trade in my opinion as the stock was so insanely overbought that it was a huge pullback opportunity. Add in the massive trend line and it likely is a recipe for profit.