Sometime later, Don is recording some ideas for Samsonite when his tape runs out; when we cut to him poking around in a drawer in someone else's office, he sees a mouse scurry by. We then go back to him putting another tape into the recorder...

...and then, when we cut to Peggy, we hear his muffled voice calling her to join him. She initially refuses, hilariously petulantly, but he's insistent, and when we cut to her sullenly coming to his door, she finds him cracking up. A sense of intrigue temporarily overcomes her bad mood, and when she takes a seat she's not disappointed, as somehow when he was looking for a tape (possibly in Caroline's desk?), Don came across Roger's memoirs, and I remember thinking on first viewing that this was going to be good. Wow, did I have no idea. Roger is apparently calling his offering "Sterling's Gold" (oh, Roger), earning a hilarious WTF face from Peggy, and then we get to the really good stuff, as Roger says that Bertram hated him, and he first thought it was because Bertram thought Roger would be a staunch ally of his father, but it was actually because of his prowess with the ladies, including some time spent with "the queen of perversions, his secretary Ida Blankenship." Peggy literally gasps at this, as well she might, and she and Don silently giggle as Roger goes on that Bertram was "cut down in the height of his sexual prime by an unnecessary orchiectomy.