Mine really isn't so bad, but I'll start the ball rolling anyway!
This was in the days when I worked in Harrods in London, and was invited to a dinner party with dh, hosted by his boss and her girlfriend, both of whom we liked and saw socially. It was on a Friday night, and I had to be at work early on Saturday morning, which they knew, and they said "7.30 for 8". Being v. punctual people, we duly showed up at 7.30 - just as the gf was arriving home from the shop with the veg! There were three other guests, none of whom turned up until past 8.30 - which was just as well, as we didn't start eating until 10pm. One of the other guests was a children's clothes buyer, and at the time I was a manager in the childrens' clothes department, so I thought, great, at least a conversation opener there - but she looked me up and down, assessed my cheap inexpensive outfit, and refused to speak to me for the rest of the evening!
The dessert wasn't served until 1am , at which point I was so knackered I almost didn't care, except the host had been going on all evening about this wonderful "Grand Marnier" dessert that they were making and how fabulous it tasted, etc etc ... well it came, and it tasted of ... yup, Grand Marnier. That's it! There was so much alcohol in it you couldn't taste anything else.
Then to top it all off the gf said "ah well, at least we can all have a long lie in tomorrow - oh, except you Miaou, hahahaha!!"
(they remained good friends though!)
More than anything I was hacked off at spending six hours with the snooty clothes buyer refusing to speak to me (apparently host and gf were quite embarrassed about it too)
Do tell yours ...