BDFT,
Around 1979 or so, I was learning how to run a Madill swing yarder (Sekiu, Washington) when the operator (Leonard Bochop...probably spelled his name wrong) tipped us over. We had a turn get loose from the grapples, so we set back to get it (guy line was slack).
About the third or forth try to pull a decent sized spruce out of a deep draw, we went past the point of no return. Leonard quietly says to me, "Hang on to something Phil...I think we're going over!" In what seemed slow motion, over we went. Sorta funny, but a bit scary at the same time. The floor was now the wall....we had nothing to walk on.
My Dad, who was the Woods Foreman, was a bit ticked because of the guy line being slack, but no harm was done to the yarder. We worked nights, so it wasn't until the next day we got to see the "reward" of the mistake. They brought in a couple Koehring loaders and a D9 the next day to put her "right side up." What fun.