Since the bulk of the post would end up in a spoiler rollover I'll reiterate that things after this contain spoilers for first time watchers.
While it's not my favorite moment in the show (that is a scene in PKW) it's definitely among the top.
It's when Scorpius is standing on the steps in his quarters (or whatever it is) as the water is flowing down around him. Particularly, it's the moment he does a half turn back to the room. He always has that amazing calm fearlessness, and the symbolism of the chair - his seat of command - being blown away as the shit implodes around him is wonderful. Coming after Crais' bold maneuver it just makes for a powerful and emotional episode. I'm eagerly looking forward to the season finale and, subsequently, season four. Though, I'm becoming more and more aware of the approaching untimely end of my favorite show ever.
Anyone else have favorite scenes?