When they are in their comfort zone though, among people they know and respect, INTJs have no trouble relaxing and enjoying themselves. Their sarcasm and dark humor are not for the faint of heart, nor for those who struggle to read between the lines, but they make for fantastic story-telling among those who can keep up. This more or less limits their pool of friends to fellow Analysts (NT) and Diplomat (NF) types, as Observant (S) types' preference for more straightforward communication often simply leaves both parties frustrated.