Imagine you're operating a machine doing several jobs a day. Each time you start a job, you have to look at a screen to check and possibly change the machine settings.

I know that, from force of habit, people will through sheer boredom just hit the return key / repeatedly hit the 'Y' key / whatever to get through the settings quickly. And yet it's vital that the machine settings are *really* checked! 

Other than randomly changing the position of the entry fields every time the user is queried for the machine settings - which I would have thought might be irritating and have the equally undesirable effect of slowing the operation down too much - how might this be done?