Barney and a very drunk Marshall are stuck in Atlantic City.
In the How I Met Your Mother episode (Season 7, Episode 23), the story follows two chaotic parallel tracks: Lily going into labor while Marshall and Barney are stranded in Atlantic City. Plot Breakdown Lily's Labor (NYC): Lily goes into labor, but Marshall is unreachable. [S7E23] The Magician's Code (1)
They secure seats on a bus labeled "New York," only to realize it is heading to Buffalo (upstate), not New York City. Barney and a very drunk Marshall are stuck in Atlantic City
Robin claims she can deliver the baby, though her confidence later wavers when she faints at the sight of the actual birth. [S7E23] The Magician's Code (1)