Sometimes, code can spit something unusual out at you. For example, take Microsoft’s Windows Vista. A screenshot of what I’m talking about is below.

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If you didn’t notice what was odd about the screenshot, I’ll tell you. The estimated time is way too much. If the estimated time is more than a certain amount, the file transfer dialog should display something like “Calculating…” or “Uncertain.”.Copying a double layer DVD to a hard drive shouldn’t take a hundred years.

Hopefully, if you have read this, you will make some form of sanity-check in your application.