Don and Megan’s post-Howard Johnson's-getaway fight – Episode Six, 'Far Away Places'
Throughout the season, Don and Megan's marriage has been a portrait of marital bliss – with the occasional vitriolic argument. The first one, in the season premiere, culminated in a round of steamy, dominatrix-tinged intercourse. But this one was way more disturbing, as Don came frighteningly close to physically hurting Megan. He had been worried sick over her disappearance (incited by Don's brief abandonment of her at the upstate HoJo's), so what does he do? Chases her around the apartment like a lunatic. When they both crumple on the floor in defeat, Megan makes this poignant observation: "Every time we fight, it just diminishes this a little bit."