I was in northern pakistan going to do a glacier-crossing,we had to walk along a few kilometers of goat-track and shepherds paths to reach the glacier,some of the tracks barely had room for 2 people to walk abreast with loose rock and uneasy footings,I had an almost overwhelming compulsion to push a companion over when he paused to look over the edge,I think the drop was maybe 120-150 metres at that point,a long fall into a rocky valley bottom.