Kman hit it right on the head...that's a hard concept for new guys, or people not in the trade, to understand. Most folks have never run anything articulated, especially where the joint isn't in the center of the machine, like a loader is.
Most folks think what they were taught in driving, "steer into the skid" and all.
You try and turn a scraper up hill, it will roll over on it's back for sure.
Turning downhill usually scares the crap out of you, but mostly all that happens is you sit there with the nose stuck in the ground. Burying the can in the ground as hard as you can ain't a bad idea either, it anchors the scraper and gives you time to get out of the cab, and go steam clean your underwear, and gives you time to think up a good excuse why you fell off int he first place!
Now, if the back slides off first, and you have a twin engine, you can idle the tractor, use the rear throttle to make the rar end slide around to where you have it straightened out, then back down the pile. Unless it's a pile as big as Tdozer posted. Then it's better to wait for help and a big ass tow cable!