When is intense too intense?

So we've been watching The Walking Dead. We're not totally caught up. Last night, we watched the 18 Miles Out episode. Big showdowns between several major characters. Big choices to be made by our hero. Big stakes. All the time. Life and death. Every second.

I'm exhausted. Granted, I'd had a long day but the episode ended and I was so relieved it was over. I've actually really liked the show. I like the questions they ask and the hard choices the characters have had to make. I know as a storyteller that to keep people interested, you have to keep making things worse for your characters (throw 'em in the Dumpster, Steph!), but I think they went too far. I 'm not sure where or when the line was crossed, but I'm not sure I'm going to watch any more of it. It's too much.

So when does it become too much? I realize we all have our own lines. I can withstand much more tension and stress in a show or a movie then, say, my sisters can. They, on the other hand, can tolerate a much higher degree of potty humor. Maybe it was simply too unrelenting this time. Usually there's some moments of humor or tenderness or something. This was just conflict conflict conflict and then a little more conflict.

What shows have been too intense for you? Or books?