Seems likely, also simply as a gauge to how you act while confused. A nervous person will probably be confused in a noticeably different way. They tell bad jok

Seems likely, also simply as a gauge to how you act while confused. A nervous person will probably be confused in a noticeably different way. They tell bad jokes to see how much you laugh, suddenly put on annoyed or aggressive personas to see how you react to those, etc. But your point about interrupting a liars narrative makes a lot of sense as well.