My hill happened one memorable year at my sister's house. She was working, so she asked me to cook at her place. I had no problem with that, except that I found out that I didn't know where anything was. However, the food got cooked and we started putting it on the table. (she was home by now)
Meanwhile, throughout this process, we had a big bunch of noisy, talking, nonhelpful family in the house, getting underfoot and in the way. Someone who I thought was helping me, disappeared and left me with the bulk of the work. When we started putting food on the table, I thought it was going to be one way, they were doing it another way, and my sister said the Dreaded Words 'You sound just like Mom'.
(Just so you know, that's the biggest insult we could possibly say to each other). So we all sat down, and I was already hot, tired, frustrated, and unhappy.
I didn't want to make a scene in front of my toddler nieces, and I couldn't just leave because I had brought a friend with me and didn't want to drag him out before dinner (He didn't drive and this dinner was WAY out in the country). And then, all during dinner, her BIL kept making jokes at my expense, causing everyone (except me) at the table to laugh.
I had it. I left shortly after, and cried all the way home. That was the LAST time I ever cooked a holiday dinner for anyone but myself, or sat through an uncomfortable dinner voluntarily. That was the day I coined the phrase "When the tradition becomes a burden, it's time to change the tradition". I changed the tradition, and now I spend very happy holidays all by myself, at home. Once in a great while I'll go to someone else's house, but I NEVER go without an exit strategy, and I'm not afraid to use it.