I like a failed breakout for a reversal signal, very effective. However, after the "flash crash" Schizo posted an ES chart to explain for me a gap in price and right away I saw a clearly definable chart pattern that I've since added to my arsenal.
I like F/U Candles (otherwise known as Morning Stars, but it seems like it's just a candle giving you the finger) and Up Yours Candles (otherwise known as Hammers, basically an F/U Candle upside down)
My favorite chart patterns: Madonna's Bras (on left) Top. And Madonna's Bras When She Is 75 (on right) Bottom.