Kerrie Mitchell
October 23, 2009 AT 09:27 PM EDT

So how are Barney (Neil Patrick Harris) and Robin (Cobie Smulders) faring as a couple on How I Met Your Mother? Well, if the upcoming Nov. 9 episode of the CBS comedy is any indication, maybe not so great. Barney, it seems, has packed on some pounds. “It’s a phenomenon that a lot of people can relate to, certainly more than a few people on our writing staff. It’s relationship gut,” says HIMYM exec producer and co-creator Carter Bays. Bays says Harris was more than game to don a fat suit for the episode. “He was loving it. He was like, ‘Give me the biggest fat suit you’ve got.'”

Photo Credit: Monty Brinton/ABC

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