We open with a quick shot of Seattle, then go straight to the hospital, and into the elevator -- where McDreamy feels like re-enacting this hair-sniffing scene from last season. It is simultaneously hot and disgusting. Shut up, McDreamy. Or, you know, don't. DAMN with the hotness. Mere is, as ever, voice-overing through all this: "On any given moment, the brain has 14 million neurons firing at a speed of 450 miles per hour. We don't have control over most of them. When we get a chill: goosebumps. When we get excited: adrenaline." Mere exits the elevator with a very happy look on her face. More VO: "The body naturally follows its impulses, which I think is part of what makes it so hard for us to control ours." Cut to Izzie, who has filled every available surface of Meredith's kitchen with freshly baked muffins. The oven dings, and she pulls out yet another batch. Oh, Izzie. She surveys the muffinly bounty and says to herself, "That's enough muffins. We don't need all these. No more muffins." And then she grabs a mixing bowl and starts cracking eggs for...more muffins. Meanwhile, Cristina pays Burke a visit in his hospital room, and as she naughtily draws the blinds, MereVO tells us, "Of course, sometimes we have impulses we would rather not control..." Cristina does a funny little strip routine, getting down to a matching red lace panty/bra set, and as she straddles Burke, he says, "What are you doing?" Uh, seriously? Cristina: "Just because you can't touch doesn't mean you can't enjoy." Just as she's getting to the good stuff, the door opens, revealing a nice-looking couple Burke addresses as "Mama! Daddy!" Oops. Burke's mother, played by none other than the fabulous Diahann Carroll, looks alarmed, and says in a sickly-sweet Southern drawl, "Preston? Is this a new service the hospital is providing?" Heeeee. Cristina scrambles to get her naked self under the covers. MereVO finishes up: "...that we later wish we had." Indeed.

Outside and re-dressed, Cristina gets into Hot Man Nurse's face about how she told him to guard the door. He says he had a code; Cristina says she had parents walk in. Hot Man Nurse says they saved the guy's life. Cristina: "Whatever. I want my twenty bucks back." HMN says he's sorry; he bought everyone coffee -- to celebrate saving the guy's life. Cristina still wants her twenty bucks back, but the nurse is gone. Meredith pops up in his place, telling Cristina it's not Tyler's fault she's a dirty, dirty stripper. Heh. Cristina's all, "You're one to talk, sleeping with two men?" Mere says she's not sleeping with either one of them -- not until she picks one. Dude! She's so ridiculous. She goes on to say that if she hasn't reached a decision by the end of the day, she's flipping a coin. Gah. Cristina: "Oh, and somehow I'm the dirty stripper." Exactly. Bailey storms over, with her Nazi boots firmly tied on, and snarks, "You two have time to round, or are you too busy getting naked on hospital property?" Snap.