More mean than funny, but a story from.my university years and my first proper boyfriend, who came with the parents from hell.
They were senior army and lived overseas for years and then retired when my boyfriend was 19, returned (oh god), bought an ugly box of a house miles from anywhere in the Yorkshire Dales and started treating their son like the eleven year old he was when they dumped him in boarding school.
They instantly hated me, and particularly that I was vegetarian, which they regarded as some kind of lower class thing.
We spent that Christmas with them visiting the horrible house in the hills which had been expensively redecorated in the creepiest of grandma chic - and bear in mind that they were terrifying. You couldn't help yourself to a glass of water, let alone a cup of tea. The MIL watched the kitchen and her own weight like a hawk. I swear she had an eating disorder, but also, she was just plain horrible, like something out of Roald Dahl. I was a smart and sunny size 10 kid with a bright future, and all I ever heard from her as a guest was how I wouldn't want a biscuit because I should be 'slimming.' 
We got to them 'too late' on Christmas Eve for dinner (6pm).
Christmas day breakfast was a small and grudging bowl of muesli, after which we were expected to wait for dinner at 4pm. No chocolates, no snacks, no wine (of course, they were too mean to drink). Apart from the Queen's speech, no television. I think I remember no presents, but just the sound of a very loud ticking clock as we all sat and looked at each other.
They had beef. My dinner was a bag of salad.
I mean that 100%. A bag of salad put on the table IN THE BAG. The roast potatoes, gravy, all sides cooked in lard. She was 'out of bread' and 'didn't keep food in the house.' Desert was something bought with gelatine. She innocently didn't know 'how' to cook for vegetarians but couldn't let me compromise my principles now, could she? removes cheeseboard, whisks away the potatoes. [Grinds teeth].
By the end of dinner I was so hungry, trapped in their freezing cold and horrible house, that if I hadn't been the world's nicest and politest child I would have started crying. Instead, I ate the salad and said thank you.
To be fair to him, my boyfriend did try to stand up for me. To his parents immense disapproval and thin-lipped rage, we went for an after dinner hike over the hills in the snow and tried to find a pub - any open pub, where I could get a packet of crisps.
We couldn't find one.
The visit lasted for another two days and I lost eight pounds.