to name a few.....
landscape gardening - sounded great. I imagined myself whistling and strolling around with a lawnmower with a butterfly on my shoulder.(?)
In reality it was back-breaking nightmare working alongside morons with communiction probs. lasted 1 week (again)
It nearly killed me.
nightshift at a postoffice depot sorting out postman's sacks into different cages. Fucking hell. lasted 1 shift.
warehouse putting price tags on cheap clothes. 100% Moron workforce.
<edit> I agree with Alice though - the slaughterhouse wins as the worst so far I think