Joan and her coke nail decided that, yeah, the Mad Men series finale was as great an episode as any to start doing coke. Look at her go. She's like your friend from high school who you just want to grab by the shoulders and say, "Wow, bud, you've changed." But then Joan and her nail are like, "Whatever, you're a square. I'm just trying to really experience the '70s." Okay, fine.