You know, that looks so ridiculous, one might think it is a joke, but I have seen people washing homes just like that here near Greenville, SC...... actually even in my sub-division there is a home that has a painting company come out every spring to clean her home and there will be two guys up there crawling around on the roof trying to clean places I could easily do from the ground.
I think one of my favorite Darwin Award pictures is one Micah found of a Student Painter (google student painter to see what they are) pressure washing off a ladder. He was wearing flip flops and the machine was sitting on a section of the roof because the hose wasn't long enough to go as high as he was trying to clean. The craziest thing about all these guys is, they think they are doing something so wonderfully right that they want to show the world how great a pressure washer they are. I won't even bother saying what I think they are....