Another neat post linked by the Geodynamic Duo at Highly Allochthonous: Center Pivot Irrigation. Here in west-central Wisconsin, this is a pretty common practice along the broad, flat lowlands that occupy much of the landscape. But something must have malfunctioned with the drive or whatever movement regulator they had on one just outside of town:
Oops. Looks like the radius of the pivot was about 20 feet beyond the utility pole.
Closer view showing the dent in the strut - that's pretty impressive for something that doesn't move very fast.