YAY! I finally have one to add here!

You know you pass when... your first cousin once removed has no idea who you are, even after numerous hints.
Yesterday, in the middle of a day of shopping for job-interview clothes, my mom and my uncle decided to stop and say hello to their cousin, who I had indeed seen before at a family reunion when I was like 8 years old.
Mom introduced me as her daughter. Her cousin gave a perplexed look as he was shaking hands with me, saying "yeah, I've... heard a lot about you." The look on his face was so obviously a "wait a minute, who is this person? I didn't know she had a daughter" look. As we chat, he tells me "I don't think I've ever met you before." I tell him that I think I met him at a family reunion when I was like 8 years old. He knows exactly what family reunion I'm talking about. "The one on Long Island?" "Yeah, that's the one." "No, I still don't think I remember you."
He never figures it out during the entirety of our conversation. As we're getting ready to say goodbye and leave, he gives Mom and Uncle Joe a hug, asks me if he can have a hug from me too, and gives me a kiss on the cheek, and says it was nice to meet me.
As we're walking out, he asks us what we've got planned for the rest of the day. And that's when Mom slips up on the pronouns, and says "oh, we're shopping to get him interview clothes. He's got a job interview on Friday," referring to me. Joe also accidentally genders me male without thinking about it. And finally, the cousin gets it. "Okay, I do remember him," he laughs, looking at me.
I just grin ear to ear, and joke "should I even bother correcting you two on the pronouns?" And we all have a good laugh about it.
Still... despite being fully aware that Mom had only ever told him about having a son, despite me speaking to him about the exact family reunion that I met him at, despite 10 minutes of conversation, and even after giving me a kiss on the cheek, he never figured out who I was until Mom and Joe accidentally outed me with the pronouns.
I'll take that as a pretty damned big compliment.