Elvis and Celine. Freaking Amazing

This is weird. I don't like Celine Dion or Elvis much, but this clip from Idol Gives Back is quite the thing.
Amazing really.
The technology that has to come together for this to happen is boggling my limited brain.
Yes I know about green screening and the such but it's still quite the feat for somebody.
So before you make the "look I'm going to puke" finger pointing at your own mouth move...check this out.