I have worked as both a barman and a waitor, and despite never working as a cashier I do have a couple of interesting stories, or at least a couple of stories I can add to this.
Working as a waiter, as a young 6ft tall man with over 10 years martial arts experience and a big build of confidence and relaxed friendlyness. One of our waitresses comes into the kitchen looking a bit upset, and takes advantage of the informal rule we have that customers who make the girls uncomfertable get passed off to the guys for service instead. ((restraunt couldn't really afford loosing the custom))
Anyway this waitress comes in and askes me to take over table 13, because the guy on the table just patted her thigh as she walked passed.
Out I wander to table thirteen with their drinks order, and there is a 60 year old woman, with her early teens son/grandson, who promptly proceeds to pat my thigh when I am putting the drinks down. I give him a little look and smile, and go one with my day, making sure I serve from the opposite side of the table from then on. *shrugs* didn't bother me much, my confidence and comfert levels were too high to be bothered by a 14 year old with wandering hands.
A guy threatened to punch my face in if I didn't give him another drink, this was mitigated by the face he was laying on the baroom floor in a pool of his own vomit.
Working as a waitor i had a single customer who returned their food to the kitchen because "It wasn't up to the right standards" 5 times in a row, at which point the chef threw the whole lot in the microwave, nuked it for a minute on high and sent it back to him, which the direction to myself that "If he sends it back again feel free to tip it over his head and tell him to piss off."
Got a burnt up hand because a woman's 8 year old tried to snatch a boiling hot bowl of lasange from a plate I was carrying, and being the nice guy I was I interviened and ended up burning my palm painfully. Mother was nice though she left me a twenty as a tip.
Guy wanted to buy a bottle of house sauce from us and when I explained we didn't sell the house sauce, he said he wanted a discount on his meal then. I explained that the company didn't give discounts for such an issue, and which point he spat on my leg and told me I could fuck off. *shrugs*
As a barman a guy tried to drag me bodily over the bar when I refused to accept american dollars (((in the uk))) as payment for his drinks. He was shouting and screaming as the security escorted him out.
I've had a woman grope my ass, she was in a group of similarly aged women, it was actually about 11am, and she just decides to grope my ass. PLace was quiet, and as you've likely noticed from my stories, my physical insecurity, and personal barriers are quiet low. So I smiled and told her and her friends that, that sort of service cost extra and wasn't avaliable till after my shift. And wandered off to go about my job leaving a group of giggling 20s women behind me.