Capturing a false glide slope is not that rare once away from the relatively low lying ground most pilots are accustomed to. A classic example is Kabul... it's not uncommon to be vectored in from the very high MSAs surrounding KBL and given a late turn to intercept the localiser and a descent that will take you down onto the glide-slope.. (pull & roll) you need to be calculating your height above the a/f (5,800ft apx) so 16 miles out times 3 = 4,800 + 5,800 = 10,600 ft if you're on the correct lobe.. not that tricky unless you find yourself getting kicked around in a night-time blizzard, struggling to hear the checklist over an indecipherable ATC instruction and partial radio failure due to ground jamming of cell-phone signals.. if it's then end of a long 6 sector day then it can become quite challenging.