Step 1 Equip Mantra of Retribution [Retaliate], Exploding Palm [impending doom], and Serenity [Instant Karma]
Step 2 Have an invincible NPC helper
Step 3 Find a champion pack
Step 4 Activate Serenity
Step 5 Tag the pack with Exploding Palm
Step 6 Activate Mantra of Retribution
Step 7 Die
Step 8 ????
Step 9 Resurrect and pick up your loot
I find this build works best with a bunch of item find gear bought for 5k off the auction house. I highly suggest farming the ghost sub-bosses with this.
I haven't tried this yet in hardcore mode, but I don't suggest trying it.
Video evidence:
How to two shot act 4 bosses on Inferno [Monk] - YouTube
Edit: Near Death Experience is bugged, if you have serenity active and take a hit that would normally kill you, the passive will still activate even though serenity kept you alive, you will be reduced to 35% health, 35% spirit and knock back all the surrounding enemies which makes it a lot harder to kill them via reflect.
I tend to run this with as much movespeed and spirit regen as I can.