A temp job one year over Christmas at a contract packager. I packaged powdered Easter Egg dye. Turned color on contact with water. Go to the bathroom, come back with purple hands. Or if any dust got on your face etc.. I'd also sneeze colors for days. That's my favorite worst job.

Same place..had to screw caps on bottles to a certain torque.. Hurt the hands after awhile.

Different place, temp work...had to use a table saw to saw chips in records (old vinyl ones) so they could be disposed of. Did that for weeks.