A porch roof collapsed from underneath the feet of some people and onto others below during a St. Patrick’s Day weekend party in Oakland.

At least 16 people were injured when a roof collapsed “in the blink of an eye” during a massive bash near the University of Pittsburgh Friday, according to harrowing video and reports. Footage circulating on social media shows the moment several green-clad revelers packed on an awning plummet when it crumples under their feet — and on top of even more partiers on the porch below.