The pizza delivery drivers are just normal people driving around in their cars. Some people are gross people. Some people don't wash their hands after they use the bathroom. Some people pick their nose. You've got these pizza delivery drivers driving around in their ride, smoking cigarettes, cleaning their ears with their pinkies, and otherwise being disgusting human beings.
As a rule, the drivers are not allowed to touch the food. But, if they're waiting on a pizza to fill their route and it hasn't been cut yet they can scoop it into the box and cut it without technically touching the food. They're not supposed to, but it's common.
There's a jar of pepperoncini peppers on the cut line. They start off the night in a fresh clear brine the color of mountain dew. As the night goes on, and the drivers are sticking their hand in there and pulling out some peppers and then squeezing the brine into the jar before dropping the peppers into the box, their hands get cleaner and the brine gets cloudy and gray. The last few peppers are swimming in a brine that looks quite a bit different than it started.
Don't eat the pepperoncinis.