I used to work with a crew doing vinyl siding, seamless gutters and other home improvement type stuff during late high school / early college days. The boss' safety talk was, "If you fall off the roof, you're fired!" I ask, "No leniency at all?" He said, "No - and you're fired before you hit the ground... no workmens comp"
He nearly had a chance to test that - one morning we got up on a roof to measure the job, walked around for a bit checking things out and he went up to step over the ridge to the other side...pretty much immediately disappears. I walked up to see what happened and found he slid down the roof and just happened to catch his foot in the gutter to stop at the edge. Turns out, when he stepped over the ridge - to the north side of the roof - there was still a layer of frost/dew which hadn't melted off in the morning sun. So he took the old slip-n-slide right down to the edge.
He nearly had a chance to test that - one morning we got up on a roof to measure the job, walked around for a bit checking things out and he went up to step over the ridge to the other side...pretty much immediately disappears. I walked up to see what happened and found he slid down the roof and just happened to catch his foot in the gutter to stop at the edge. Turns out, when he stepped over the ridge - to the north side of the roof - there was still a layer of frost/dew which hadn't melted off in the morning sun. So he took the old slip-n-slide right down to the edge.