Not at someone's house but my Mum's school packed lunches for me make me retch if I remember some of them.
I don't know what It's called but that sort of, jelly-textured too-soft-to-be rubbery bright pink fleshy horrible jelly-like 'meat' that I think used to come in a round tin with a key to oepn it? In a sandwich. Urgh. I feel sick thinking about it. It fell out of the sandwich as soon as I opened it. Gross.
I was vegetarian from aged 11 (not just because of that) and I remembered going to my Grandmother's house for boxing day once, she rang once she learned I was going to be there (I was about 16' as 'I've nothing for the kid to eat'. My dad had to get me a pot noodle from an 'open every day of the year' corner shop. He looked so embarrassed when he walked out of the shop with it! My Grandmother put it in a bowl as she was not happy at me eating such on boxing day! Not innkeeping with the thread that, though, I love pot noodles even now, and I am a pretty decent cook!
Off topic but, my Mum (who is the most brilliant woman I know in her other, many ways) is notorious even now (and I am in my forties) for forgetting to cook for me at family gatherings. Twice at xmas she's forgotten to put my main course in the oven. Usually a pie or 'meat substitute type thing that would take 40 or so minutes to cook through. I have done a lot of hanging around, while everyone else eats all the veg and potatoes and is almost finished at the table before mine cooks.
Another time the whole family was having fish and chips and I said I'd bring my own food. Everyone was about to sit down and had done so (moments before,mind!) by the time I'd warmed up a vegetarian main I'd cooked in advance. I went to the table and there wasn't even a space for me-they'd not set one. When I asked was there not somewhere for me to sit? (It was obvious in hindsight, but I was a bit shocked!) they all just looked at me. And said nothing at all. I ate mine sitting on a bar stool at the kitchen worktop, until my (then 12 year old)niece who's such an angel even now, said 'Patience, I've nearly finished, go and sit at my place, It's not fair you being in here'.
Joys of being vegetarian in a family full of hardcore meat munchers I suppose.
I'll give a famous chain restaurant rhyming with swanky and rennies a mention.
We all ordered fajitas and the two vegetarians had not much other than onions, to put in theirs. Onion fajitas. I think they'd ran out of veg.
I complained and was given a voucher for a free main course for two people.
We didn't use it.