For super dramatic black and whites, scenes that are high contrast i.e have dark blacks and light whites with very little grey, work fantastically well.
When color is converted to black and white, it turns into shades of grey. Good black and white photos tend to have a wide range of tones, in other words a mix of black, greys and white, whilst poor candidates for black and white photos will have mainly grey tones. For super dramatic black and whites, scenes that are high contrast i.e have dark blacks and light whites with very little grey, work fantastically well.