The Hound of the Baskervilles
When a reliable chart pattern or indicator does not lead to the action you expect and prices move in the opposite direction, this is what Dr Alexander Elder referred to as "The Hound of the Baskervilles" signal.
When a Head & Shoulder pattern gives a strong sell signal but the market refuses to collapse and rallies from the right shoulder, it gives the Hound of the Baskervilles signal. When prices rise above the 'head', it is time to cover shorts, reverse, and go long.... ( page 105, Trading For A Living - Elder)