How I Met Your Mother Spoiler Pics: Barney is Fat

How I Met Your Mother is one of the funniest shows on TV. But this isn't a joking matter:

On the sitcom's November 9 installment, Barney Stinson gives in to what producer Carter Bays refers to as a "relationship gut." Having already gotten the girl (Robin), the character really lets himself go, risking diabetes and heart disease.

"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,” Bays told People magazine.

The show's co-creator added that Neal Patrick Harris was more than game to don a fat suit:

“He was loving it. He was like, ‘Give me the biggest fat suit you’ve got.’”