How do you like your coffee? Are you all-kinds-of-stuff in your coffee kinda person? Or are you a simple, just black kind? According to a new research, this simplistic order of just black might be an indication of an unstable mind.

The study was published in the journal Appetite. It suggests that people who prefer the taste of plain, black coffee are more likely to have psychopathic tendencies.

Researchers from Innsbruch University in Austria surveyed 500 men and women and measured them against aggression levels, personality traits, psychopathy and narcissism, and sadistic tendencies.

Those who showed a love for bitter foods like black coffee was "positively associated with malevolent personality traits, with the most robust relation to everyday sadism and psychopathy."

Really now?

What do you think? Or are these people who order coffee this way the real psychopaths: