Many, many moons ago I worked for exactly one week in a sweet factory, and that one week has been a scar on my soul ever since.
It was one of those summer holiday jobs that all students in my day used to take on in order to get some money to have a decent break in the second half of the holiday, and I had managed to land a job as an unskilled worker at a large local sweet factory.
On my first day I was sent to help the guy who made chocolate. This was intriguing to begin with, as it seemed to entail him slinging apparently random quantities of milk, sugar and cacao powder into three large vats, each of which had three huge stone rollers rotating slowly in them.
This is roughly what they looked like.