I helped pay for my college by working a summer in a food processing plant. I won't say what product but it was packed in glass jars. Working conditions were absolute hell, most new workers quit within a few days. Those of us who stuck it out longer than that had to find ways to cope to make it through the day. Lots of random fukkery used to go on, like trying to see how much product we could stuff in a single jar, as a joke. But two things I'm thinking about are the worst.
First, whenever product was rotten, or discolored, or too broken, or dropped on the ground, it wasn't thrown away. We were just told to throw it in a bin that went into a different more highly processed product line.
Second, whenever a jar broke on the line there could be broken glass anywhere and that was a serious consumer safety hazard, so you had to do a full clean. Everyone was pulled off the line and the maintenance guys came in hosed the entire belt clean before we could start again. That was one of the few breaks we got in the day. So some workers started grabbing a few pieces of broken glass whenever a jar broke on the line. Then later, when they were tired of the bullshyt and needed a break, they would just toss some of that glass onto the line so someone would call "Glass!" and we'd get another break. They couldn't call it themselves, though, cause they'd get caught if they were always the ones calling glass. So I have no idea how often they threw broken-up glass onto the line and some of it just ended up in jars without anyone catching it.
