I just had to post this.
I'm not talking epic as in you 3 shotting a boss, or 500 little 30hp minions. I'm talking about a demonic balls to the wall ambush.
I go to the second level of the Silver Spire, on nightmare. Talk to the image of Rumford, and the ambush begins. In comes(from the north) Turrask, Patron of the mad, with arcane enchanted, and horde, so he has like 5 mobs with him to begin with. Then Rumford spawns the elite mob who is supposed to be there, and the checkpoint you revive at on death.....is right on top of them.
This is a full scale, gonna kick my ass invasion. I die, and realize that I'm going to be rezzing on them, to which, I die again. Third time I rez and book it for the teleporter. I regroup, change my spec, port back, and they are waiting for me. 1 second into the level down goes the arcane orbs along with 90% of my health. I kill 1 of the non-elite mobs and get the hell out of there.
This was one of the best fights I have encountered in D3. Lots of fun.