and for the non car related,
was abseiling on the cliff face to the left of the hunua falls and after umpteen times going down the practice wall (thats not vertical and rather small) using figure eights, i was to be the first of the group to go down (apart from the guy who set up the line). so i rocked up to the top of the cliff and was told to put a device on called a rack instead of the normal figure eights. and the way these things work is that theres multiple bars across it and depending on how many bars you wrap the rope around you get different resistances (from memory 4 bars normal person, 5 for a larger and 3 for a kid) so the instructor wraped it around 3 bars and off i went..... without enough friction on this thing to be able to stop myself so skidded down the side of the cliff to a well positioned 20cm ledge that i was able to stand on and hurl abuse to the abseiling instructor until he came down the second line, adjusted my rack and sent me happily on my way. but he cheeted his way back to the top by prusiking.
(red is where i started the decent and green is where i found that ledge, all when i was about 13)