I always liked those Bollinger Bands. One time when I was really down on my luck, I developed a rules based system trading them.
So it worked out ok for a while, until Alan Greespan started talking. I mean it went on and on. One minute he was talking about rates, the next minute he was talking about "irrational exuberance" And within 30 minutes, everyone of those bands got hit (and I had them set really wide) so I religously bought and sold according to my rules.
At one time, I was down more than I had ever been in my life. A few minutes later I had made a fortune.
When it was all said and done, I ended up about even.
Back then the conclusion I came up with was, "See? those Bollinger Bands work!"