The holidays are a time of merriment, festivity—and, for many, stressful family gatherings. People think, "'How do I deal with relatives who, at times, are intrusive or trigger me or say things that are abusive?" said Mark Rapaport, president-elect of the American Psychiatric Association. When trying to defuse stressful family dynamics, some people use a strategy called "gray rocking," the AP reports. The point is to "act boring, like a gray rock," said Samantha Whiten, a Maryland-based clinical psychologist. "You do not give difficult people any potential ammunition." Here's what to know: