I've rewatched this show god knows how many times so many great lines and the dialog never lacked; but one in particular is the conversation between penny and don at the end which is heart renchingly beautiful.
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ULKTLVdwEh4.html Talking about this scene? Agreed, it was beautiful and not only did it show us the weight of all the decisions Don made in his life but also how important he felt Peggy was to him, tying their relationship, through all the ups and downs wonderfully