Among the more tragic automotive mishaps we can think of, having a dyno fall apart in the middle of your pull would have to rate pretty high. It's especially unfortunate because, by the very nature of the thing, it's only going to happen when there's a high-horsepower car on the rollers. Nobody dynos their Toyota Camry because nobody cares how much power it puts out. It's the cool cars that need it.

Here we have a video which is a prime example of just why this is such a terrible thing, a dyno giving up with a Shelby GT500 on it.