I was at a job site today and saw this mind blowing excavator moving around. I managed to remember the name of it which is Menzi Muck. It's a Swiss made all-terrain excavator. By all-terrain I mean ALL-TERRAIN! There's a video on the website where this thingie is sitting on the side of a mountain with one out rigger on a stump for support. Click on the multimedia tab to see tons of videos of it in action.
http://www.menzimuck.com/en/produktegruppe/typen/a111.html
http://www.menzimuck.com/en/produktegruppe/typen/a111.html