Putting Star Wars Tazo's in packets in Walkers crisps. Sat high up in the factory, as the crisps descended, you would have both hands poised above two shutes, a red light would come on indicating the correct time for you to drop your tazo to reach the individual bag of crisps.
I lasted 6 months doing 12 hour shifts, from 10pm-6am, in a hot, greasy environment with its fair share of social problems that were brought in from the outside to the workplace (religious intolerance, racism, fights, hard drug abuse, sexual harrassment). Many of the workers, some with extremely suspect hygeine, constantly helped themselves to the convey belts of freshly fried crisps.
I haven't eaten a single crisp since.