The food industry is plagued by stories of unsanitary acts that would make anyone that has eaten their food gag. This especially occurs in cheaper restaurants, as the workers are paid less which results in little to no vetting. These people have little to do this, and are more prone to doing these types of acts.
Perhaps the one with the worst reputation are pizza chain stores. We have reports of individuals tampering with the dough, not cleaning the kitchen, to taking a dump without washing their hands then going straight back to pizza making. It is horrifying to imagine, and sometimes ignorance is bliss. Another would be engaging in indecent acts during working hours.