Duping delight is when a liar is secretly extremely pleased that their lie is being believed, and their delight leaks through in the form of suppressed smiling.
Duping delight can be difficult to notice. To me duping delight comes across as more of a smug or contemptuous look, so keep an eye out for inappropriate smirks, often masked with a blank expression, or an emotion that best suits the situation (such as showing sadness if that’s the most appropriate emotion for the liar to demonstrate). #nonverbaltips