njguy2 said: "Medea with Fiona Shaw"
I would also say Medea, though mine would be the BAM production with Rose Byrne and Bobby Cannavale. On a similar note, I would add current production of Oedipus. The fact that both were more of a modernization added to this - of course I knew what tragic end the story was heading toward, but it was how it would play out in each context that kept me engaged. With Medea, it was waiting until Anna (Byrne's modern Medea) finally snapped, like waiting for a collision that you were powerless to stop; with Oedipus - especially with the on-stage countdown - it was literally knowing a bomb was going to go off, while everyone went about their business unaware that something catastrophic was going to occur, waiting for both that moment and the aftermath.