I know the possibility of this happening is extremely rare, but I feel it's worth considering, however remote. Should you be driving to an extremely important business meeting and you get distracted by a great landscape possibility with a dramatic sky, don't park up and vault a dry stone wall into a field of deep, deep heather which may hide a quagmire that could swallow you up to your knees. Arriving looking like a bog hopper could take some explaining. Bear it in mind however unlikely it may be.
