when i rode it a couple years back, there was a dumb kid that would not cooperate with the rule "keep your feet on the ground, your back against the wall, etc.". it was kind of funny though... the ride operator - just like anyone else would have - got pretty ticked off and stopped the ride completely, then re-informed the kid of the rules again (in a VERY irritated voice) and finaly restarted the ride. so, yeah, i think those accidents where probably caused by rider misconduct, causing it to close. people are dumb.