HAVE YOU EVER BEEN IN A fight with a family member or significant other and had the other person categorically deny facts that you both know are true? Have you ever had a boss or colleague blame you so convincingly for something he or she did that you ended up doubting your memory? Or, when you've questioned someone about what he or she was doing in a particular instance, has the person turned around and accused you of being crazy, confused, overly sensitive or ... (fill in the insult)? If so, you're no stranger to gaslighting: an insidious form of...