> After I've gone through all the features I slip with my finger and drag the handle a little too harshly... It's amazing how many bugs are hidden because we d

> After I've gone through all the features I slip with my finger and drag the handle a little too harshly... It's amazing how many bugs are hidden because we developers subconsciously interact with our apps in ways to prevent them from breaking. We're not deliberately trying to do it, but we instinctively know that if, say, we drag the handle too hard it might not react appropriately, or if we click the button while the script is still loading it might do the wrong thing, or whatever it is. This is why we have QA. In many ways this is similar to authors who need a fresh pair of eyes to see all the typos and other errors.