Geminis, though fun-loving and witty, have an unpredictable dark side. To be honest, some have even referred to the Gemini as the "psychopath of the zodiac," per Nylon. 

According to astrologer and hypnotherapist Patricia Lantz, "dark" Geminis have difficulty empathizing with others and are unable to understand the emotional consequences of their actions (via Love to Know). "They tend to act without regard for others and feel no guilt or remorse," writes Lantz. "It's this lack of empathy that leads to all of Gemini's darkest traits."

According to Lantz, Geminis (if pushed) will exhibit a number of negative traits — manipulative, back stabbing, liars with an impulsive behavioral problem. Oh, and they love to create chaos amongst family and friends. The worst part of all of this nonsense is that Geminis are pros at pretending, until they've gotten what they wanted (via YourTango). So, when it comes to befriending a Gemini, you may want to watch your back.