Leslie and Justin meet Frank , a strange and depressed man that have constant panic attacks . Leslie begin to have doubts about bringing him to her mother and try to call it off , but Justin insist that they should " let this unfold " . At the dance , where Andy 's ( Chris Pratt ) band Mouse Rat is playing , Frank meet up with Marlene , who is repulsed by Frank 's past , current unemployment and overall failure at life . She turn down his offer at a second chance at love , prompting him to storm onto the stage and denounce her over the microphone . Leslie apologize to her mother for bringing Frank . She is later upset with Justin , but have trouble pinpointing the reasons for her dissatisfaction . Ron ( Nick Offerman ) explain that Justin is a " tourist , " meaning that he take " vacations in people 's lives " and only care about telling interesting stories to impress other people , which make him selfish . Two older women then recognize Ron as jazz saxophonist Duke Silver , but he deny it . Leslie later break up with Justin , which Tom ( Aziz Ansari ) take especially hard , reacting as if his parents was getting divorced .