I partly blame an old Discovery Channel episode I watched as a teenager (probably Dirty Jobs?), which highlighted a line of men standing in front of a conveyer belt at some kind of recycling or garbage plant, manually sorting things out of the waste by hand before the bulk of it got dumped into a huge vat of treatment water. The impression it left on me was that there's always a bunch of dudes at the conveyer belt who were going to check and make sure nothing unrecyclable went into the recycling process.