Did a few months working offshore on the rigs in North Sea as a Roustabout, which means 'general dogs body' in proper english. Worst part was working in the chemical room - hot airless room wearing thick overalls, big wellies, rubber apron, goggles, leather gloves, filter mask and hardhat having to pour various 20kg bags of stuff slowly into the drill mud for a 12 hr shift!
Sold Filter Queen vacuum cleaners for a month - they cost £1200 and we had to go round to pre arranged appointments to demonstrate its cleaning ability and then really hard sell using ALL the tricks in the book! I sold 2 to little old ladies who really didn't need them - not that anybody really needed them...
Did one 8hr shift at a factory on the Mayonaise conveyorbelt taking the 8-packs off the rollers and stacking them on a pallet. And thats all you do for 8 hrs! You don't even take the pallet off to somewhere else, thats another persons job, you just stand in the same spot doing the same few movements. I told them to fk off and walked out after being asked if I wanted to continue for another 4 hrs, and the rate I thought I was getting was incorrect as I had been quoted the night shift rate not the much less day shift rate! People on that line had been doing it for 25 yrs in some cases

better people than me for sure!
Worked for a magazine distibuters for about a year but got 'promoted' to the magazine office from the customer services phone office. My newly aquired post's day consisted of copying numbers (no letters at all, just numbers) from a printout and typing them into a computer. ALL DAY LONG! Kinda lost the enthusiasm after that and quit after about a month.
In order to get my current job as Paramedic I needed to gain some work experience of doing care work. So I helped out at a care home for elderly 3 days a week for a month. Had to get the old folks up for their brekky which meant toileting and washing them and cleaning up after the odd misshap during the night

. Bassically as soon as you walked into the building the stench of urine was in your face - and that was the best of it! Again to all those who do that for a living, I take my hat off to you because I couldn't do it.
My work as Ambulance Paramedic gives some people the shudders but its not too bad at all due to the variety of stuff we do. Ok we do deal with some gnarly stuff but just as often we deal with nice stuff, or do nothing but watch tv for an entire shift, or cruise about in the ambulance on a saturday night checking out the hot ladies who are pissed and like men in uniform

and then have to scream off heroically with the blues and twos when the radio says so.
During my life I've worked out, for me at least, it is the monotony of a job I find hardest to deal with.
...still don't know what I want to be when I grow up tho...