Yet, what worried him was that even after an initial positive reaction, the stock dropped. So, a few days later, Cramer assumed it would take out its $18 level and went back to buy more.
Cramer was wrong — extremely wrong.
What Cramer didn't realize is that the fluctuation in price had traced a perfect head-and-shoulders pattern. And no, this isn't referring to the brand of a shampoo.
It turns out that during that period when the head-and-shoulders pattern was forming on Alcoa's chart, Europe and China began to slow down, and aluminum was in a glut. Ultimately, CEO Klaus Kleinfeld could control his own company but not the price of the commodity itself.
Likewise, if a head-and-shoulders pattern signals trouble ahead, then an inverse head-and-shoulders pattern signals the opposite — a chance for glory.
"The key with this pattern is the neckline, the line that connects the high to the two shoulders. When a stock breaks out above that line it tells a technician that you are about to witness a big move higher," Cramer said.
At the end of the day, patterns matter. So when you see a head-and-shoulders pattern, no matter how confident in the stock you might be, Cramer believes you should sell. And when the reverse head-and-shoulders develops, then consider buying it.
That is just how powerful these moves are. The chart work is more often right than most would ever think possible.