LLMs are pretty bad at coming up with original jokes, but often they can at least explain why some jokes are funny. I was playing around with a dataset of jokes and noticed one that LLMs tend not to get at all. It's not particularly funny or clever, but it relies heavily on a good theory of mind. On one run, Gemini Pro did manage to get it, but it was the only one. GPT 5.4 Pro, Opus 4.6, and Grok consistently miss it.