Ok so my friend found this a few days ago and didn't really realize it till today. He wasn't sure what he was doing but he stumbled upon it tonight and was telling me about it. So it's very simple. You summon as many minnons as you can. Find an elite/rare mob(s). Make sure you go kind of slow as once you seem them on the edge of your screen your pets will rush over to them and start hitting them.
The trick is you stand so that the mobs never come into the screen fully and your pets will sit there and damage them. the cool part is that the elites/rares will not fight back either, they simply sit there and take the hits from your pets. Once they die, grab your loot and enjoy your stack of NV. It can take some time but it's low risk and can net you a good bit of gear. I seen him do it on hell mobs in act 1 and 2.
I'm positive this will work in inferno also since the idea is pretty much the same. I encourage those with a witch doctor to try this and post back here. I don't have a witch doctor so I cannot try it. sadly