See other failures under 000.html.
From http://www.trials-forum.co.uk/topic/117875-square-taper-or-isis/ as of 2013/08/24:
Posted 2008/04; Shimano "Deore" model cranks, history otherwise unknown.
Pedal eye threads stripped. Note this crank was used riding observed trials.
Note pedals are prone to move under high load, which wears away both the face of the crank and the threads. See also Jobst Brandt Collet.
See also FAIL-188.html.