I can't seem to find whether this was just failure of the dyno or operator error. There looks to be a blown tire (or maybe it's a belt from the dyno) laying on the ground. If I were to guess I'd assume a bearing on the dyno froze but holy hell, that's some destruction.
[youtubehd]zfNq8uPIQ1k[/youtubehd]
[youtubehd]zfNq8uPIQ1k[/youtubehd]