Had a guest of the hotel/restaurant I work at now show off his Special Snowflakiness.
When the hotel has big groups in for events, they have the option to purchase coffee for the group. Said coffee, if it is a serve-yourself setup, may include large disposable coffee cups. The cups are NOT available as part of the lovely hot breakfast spread this particular hotel chain puts out - we simply do not have access to them in the kitchen, as if they are in the hotel at all, they are in a locked storage area. The group event team orders them in when they're used for events - it's not something we regularly stock or even need on short notice.
This guest spent the better part of ten minutes trying to cajole one of these cups out of me. Yes, I was really this polite to him about it - it's what I get paid to do. He didn't get angry about it and he wasn't actually rude about it either.
Guest: Can I get a bigger coffee cup?
Me: I'm sorry sir, the cups we have out are the only size hot cups we have - the mugs and the foam ones that you see are what we have.
Guest: But I want one of the bigger ones.
Me: I'm sorry but we don't have bigger ones - I wish we did, because I'd like to use them for drinks too.
Guest: But I used to get bigger ones here.
Me: I'm sorry, but the ones we have out are all we have in the kitchen. You can take as many of the disposable ones that are out here as you want though.
Guest: When you do the big events sometimes you have bigger cups.
Me: I'm sorry sir, but even if the event staff does have them, we don't have access to them, and I'd be in big trouble if I tried to get into their supplies.
Guest: But when I was here last year, the girl would get them for me. Say you weren't here last year, were you?
Me: I haven't been here that long, and none of the other staff was here last year either. We don't have any big cups available at all, sir. Even if banquet has them in for an event, they're counted out for that event and stored in a locked cabinet, because someone else has paid for them.
Guest's mother (a lady with a classy southern accent): "Land's sakes, son, quit bothering the lady and get one of the cups they have out there."
The guest was somewhere in his thirties - his mother, however, had that "I was pretty sure I raised you better than that," look and tone. I was barely able to keep myself from laughing at that point. He sheepishly slunk off to the drink station.