What’s the most useless bit of knowledge you have?

I’m a programmer, and most programming requires you to understand parts, if not entireties, of other people’s jobs/roles in order to develop for it.

So over the years I have large and ever growing information about Real Estate, Conveyancing, Special Assessments, Settlements, Mobile Homes, Child Services, Archives and Records, it goes on.

It’s something where I pray that the knowledge will come up randomly and I’ll just sound SUPER intelligent in a conversation, but none of it ever will lol