I'm usually serious in therapy. Mostly, I don't want to waste my 50 minutes a week. Also, a few times my therapist made a joke or laughed about something but I have this lag time before I get it which shows up most one on one. He laughed about something a few weeks ago which I didn't get why it was funny (not offensive just wtf). I just politely waited for him to finish. The first session he laughed a lot but stopped. Not sure if it was to mirror me or what.