Bank teller - involves a LOT of money counting, people trying to get over on you, family members trying to steal from one another, ID theft like crazy, and the like. on top of that, we also get secret shoppers and frequent policy changes which ...can be frustrating for us and the customer.
Also, if you become a teller, you WILL have disdain for the elderly, grandma / grandpa is not so sweet when they enter the bank. ive had my window smacked with a cane, yelled at, a cup of piss dropped off in my slot, people crapping themselves (well, not their fault...mostly), and also the frequent berating. 9/10 it's because we ask for ID
...but hey, it's a job.