As two lives hang in the balance in the blood-splattered operating room, Dr Callie Torres and Dr Owen Hunt belt out Snow Patrol's Chasing Cars, joined by the normally straight-faced Dr Bailey who pipes in with the third verse, right after ordering A-positive blood.
Later, leading stars Derek (Patrick Dempsey) and Meredith (Ellen Pompeo) merrily join in with a cast sing-along to Jesus Jackson's Running On Sunshine.
Yes, the dream sequence-induced musical episode has come to Grey's Anatomy. When news of the show breaking into song came out last year, viewers weren't alone in their bewilderment. Among them was Kevin McKidd (Dr Hunt).
"A lot of people were nervous. And rightly so because both the network and studio were like, We're not sure about this musical idea - we need to see something."'
McKidd, who also plays guitar, was one of the first people producer Shonda Rhimes turned to to help convince the show's backers hat that the prime-time drama could successfully jump on the Glee bandwagon. Deciding Rhimes' initial idea of having him play acoustic guitar for the big bosses would be "'more like an episode of The Office", McKidd brought in a full band.