How to stop a conversation

Some 15 years ago Sandra and I attended a holiday party sponsored by her company's division. She managed a system administration and software development team of 10 people or so. A woman who worked for Sandra, along with the woman's husband, joined us at dinner table. The conversation meandered, I'm not sure how it was that Sandra and I learned how the husband in this couple wore fishnet underwear. Who knows what bit of life-saving knowledge has been blocked from my memory because I have the image of this guy, wearing fishnets, in my beleaguered brain?