There were a few
My sister (3) and I (6) had been visiting our uncle and his wife near Munich the week before Christmas and were due to travel home on Christmas Eve with my uncle and his wife.
That morning my sister found a bottle of cough syrup, opened it and drank from it, that was at the time where child safety lids were not on bottles yet. Uncle's wife saw her as she took the bottle from her mouth, then proceeded to force feed me a few spoons of the same syrup while telling me "See what you did, you should have stopped your sister, now we have to take you both to hospital to have your stomachs pumped out".
My uncle was more pragmatic, rang the pharmacy who said that, while not recommended for children, it would do no harm.
On the way home we were in a traffic jam as there had been a mass lorry crash due to fog and I was most upset as I was supposed to play the only speaking shepherd in the church Nativity Play that afternoon. We managed to get home just in time.
My uncle's marriage didn't last much longer, thankfully.
About six years later we went to my maternal grandmother's on boxing day, the whole family gathered, and we saw lovely presents under the tree - only it turned out that they were all for our baby cousin and none for us. On top of that, we all got food poisoning as my grandmother had bought the cheapest meat she could get and it had gone off.
The worst though was in 1996, I was 18 and my dad had been diagnosed with cancer that October. On the 23rd I woke up to find my mum gone, phone next to their bed. I took the phone to my room and my paternal DGD rang to say my dad wasn't well but he was "still breathing".
At 10 that morning my mum's youngest brother rang and told me, quite gleefully, that my dad had died. Yeah, thanks very much you idiot. I never quite forgave my mother that her family knew before we did, in fact, they must have known for a good couple of hours as they rocked up about 20 minutes after that call invading on us and my grandmother making it all about her, how she had lost her son-in-law, how she was inconsolable, how she had it hardest while expecting us to wait on her hand and foot. For once, my mum stood her ground and sent them home.
Christmas that year was not happy at all and has not been quite the same ever since.
This year will be hard, as I won't see my family in Germany, but we will make the most of it and have a Zoom Christmas.