'Mad Men': Roger and Marie (Season 5, Episode 7)
Sally Draper said it best. Most of the hookups that went down on Mad Men this past year can be summed up in one word: "dirty." There was Don and Megan's hate sex on the living-room floor, Joan sleeping with the Jaguar exec in exchange for the account and a partnership, Pete's affair with his commuting buddy's wife (who then underwent electro-shock therapy, wiping the entire relationship from her memory), and Harry's backdoor office tryst with that creepy Hare Krishna lady. But the seamiest hookup of all had to be Megan's Québécoise mom, Marie, giving Roger a blow job during an American Cancer Society gala – not in the least because it was witnessed by impressionable 12-year-old Sally, who will singlehandedly keep therapists in business for years to come.