Jobs I could never do, out of principle
As I watched one of the vultures hover around some cars parked at meters, I realized there is one job I will just never, ever do: meter maid. So I decided to think of other ones I find just repugnant.
1) Parking enforcement
2) Any position in a slaughterhouse
3) Speed camera installer
There are more, I'm sure, but that's what I've got for now.

mobile advertiser?
I would like to have thought "crack whore" would rank higher, but I totally understand these too.
Mindy! Lucky your boss doesn't read this! hahahaha
I thought of another one, I can't believe I forgot it the first time: tow truck owner/operator. I have this fantasy of breaking into a tow truck parking lot and towing all their tow trucks. Then THEY'D know what it felt like. And to get them back, I would have only very small windows of availability, I'd be located about 90 miles away from the original site, and I'd charge about $500 apiece to get them out, plus gas.
God, that'd be good.