I worked with someone who would tell me very precise weird personal details (eg, “the left side of my mouth can’t taste”).

I found it odd because they weren’t really pertinent and seemed really unique that I’ve never heard of anyone else with the condition.

I suspected he did this to try to determine who they can trust when he would remark that people were liars or not trustworthy and one time a coworker told me a completely different weird detail about them.

I never got a chance to ask them about this technique before we stopped working together.