“Humorous story” (not sure if it’s appropriate to use that adjective in this context) that I was reminded of by my above statement: “I don’t remember if he was referring to a case of “shogeig” or “meizid” , but I’m pretty sure it was both.”
I just remembered why the idea of eating treif beshogeig came up. I think the Rav had actually given a different example, but I was reminded of an incident that had happened earlier that day and asked him about it.
I had been eating the Shabbos Seudah at a friend’s house, and she accidentally served her husband milchiks ice cream at the end of a fleishiks meal, mistakenly thinking that it was pareve. He was clearly really upset although he was trying hard to control himself. In order to lighten the mood for the sake of Shalom Bayis, I commented, “How appropriate that this davka happened on Shabbos Parshas B’reishis!”
I don’t know if it sounds funny in print after the fact, and maybe it’s inappropriate to refer to an incident involving eating treif (by accident) as funny, but the way I said it, it was very funny at the time, and it did the trick because it did get him to laugh.