In So. Cal. I helped a guy put on tile roofs for some side $$. We left a job in Lakeside because it was drizzling and we weren't exactly comfortable up on the roof, considering it was a 2-story built into the side of a hill. We finished papering the roof and got the heck out of there. The next day we climbed up on the roof seeing that the roofing supply co. loaded the roof for us. We saw a perfect set of "ski" tracks going right off the roof on the downhill side. It turns out that one of the guys loading the roof thought he could get by with the worn tennis shoes. The dampness combined with the slightly sandy paper = a good ski slope. He landed in the soft dirt on his feet not 5' away from the pile of scrap lumber. When we saw him, he had new shoes on! The ground was soft enough so he wasn't hurt except for all the crap that he had to take from the other workers!