It seems like only yesterday that medical dramas were an intriguing novelty and George Clooney’s name elicited an uninterested “Who’s that?” But after 15 drama-filled seasons, ER aired its final episode April 2, 2009 and we said goodbye to the doctors and nurses we’ve loved, hated and tolerated throughout the show’s impressive run.

County General Hospital endured countless emergencies over the last decade and a half, but some of them were more chilling than others. We’re taking a look at some of the medical drama’s best moments.