There are several times during the course of my duties when I might not try as hard to be quick. If you're a dick, I'm not too worried about how fast you get your Coors Light and Cheetos. If you're really interesting, I'm distracted enough to not be as fast as I can be.
Today may have been the best, though. In my line, separated by one kind old lady, were two Vietnam Vets who were exchanging stories. Both were diabetic, one had just had half his foot removed because of an infection.
Between the first, the nice lady who helped the second get his groceries out of his motor cart, and the second, I got a good half an hour of honestly interesting conversation.
Of course, I thanked them both for their service, and watched out of the corner of my eye as they stood near the doors and kept talking for another twenty minutes.
These are the times when I actually like my job, instead of liking my paycheck.