Fat Susan's doorbell rings, and it's Mike, who introduces himself, but she says they met at Mary Alice's funeral. He's there to fix her clogged sink, and she makes small talk with him while he works on her pipes. She gets a call while he's working, and it's Karl telling her he'll be working late and his work switchboard will be closed so she can't call. Susan tells Mike that her husband's screwing his secretary and suggests maybe it would be great for him to come home and find her in bed with another man. Mike jumps up, saying he has to go get a part at the hardware store. She kisses him, and he starts to head off. Susan asks if she's that undesirable and the writers go for the easy joke, having him say she is, "in a big way." He does tell her she's pretty, but married, and that if she's unhappy, she should do something about it. She eats dough out of the bowl, then catches her reflection in the toaster and throws the bowl in the sink.
Flash forward further, and a slimmer Susan is coming down the stairs carrying weights. Karl has his bags packed, and she thinks it's another business trip, but nope, he's leaving her. He just can't do it anymore. She can't believe that's it after 15 years of marriage, but he doesn't know what to say. She suggests thanking her for losing weight for him, and for wasting her life on him while he went out and "banged everything with a GED and a tramp stamp." He points out she could have just let him leave the first time, sparing herself this pain. He tells her she really does deserve better and leaves. Back in the real world, a doctor comes in and tells Susan that Karl didn't make it. He leaves, and Mrs. McC can't imagine what Susan's feeling. She tearfully says she's mostly feeling grateful. That's a weird reaction to his death, I think, even after that "what if."
Anyway, now it's Bree's turn. She'll surely have a nicer "what if" about Karl, since she was planning to leave Orson and marry him, right? She's asleep in a hospital bed, when Mary Alice explains she had to be sedated after being told about his death. She began to dream about what her life would have been like if Karl hadn't died. In her dream, he carries her over the threshold and tells her he's doing marriage right this time. Just what every newlywed woman wants to hear, right? They kiss, and she tells him how happy he's made her. She tells him to take off her zipper with his teeth and take her on the table. He teases about the nagging now that they're married. She says the bedroom will work, too, since it's their bed forever. He promises he meant what he said when he proposed: Being with her will make him into a whole different man. She hopes some things don't change.