Robert Michael Pyle said this quote
“ I thought of a sign I had seen... another scary time, when I was two hundred feet up in a giant karri tree in South West Australia. At the point where the precarious spiral ladder grew even steeper and narrower to reach the fire-watch platform atop the tree, the sign said: 'Reassess Your Situation Now: Turn Back if You Are Not Comfortable'. Then, as now, that seemed like damn good advice. ”