Flash back to Becca and Barney, separated by security glass. They talk on the phone as Barney feeds her a line about being in a prison of his own heart, while trying to hurry the guards into letting them start their conjugal visit, when another attractive inmate is escorted into the room. Barney drops Becca mid-coversation and goes over to the new inmate and gets her to pick up the phone in her booth. Is it a booth? I don't know the terms. I haven't been to prison... yet. "Hi. Barney Stinson. Attorney-at-law. Let's talk about getting you off." Oh, show. Becca flies into view and attacks the other woman. They fight and it takes three seconds for Barney to remember he enjoys it. I was a little worried for him for a tick, weren't you? He manages to film it on his mobile and we flash forward to the present. Barney says he now gets letters from Becca. "And she's all 'I'm coming to get you the day I get out of here. I'm going to hang your eyes from my rear-view mirror'. Women, huh?" Robin just looks down and shakes her head.