Whooooo are you? Who, who, who,who?

A kid comes into the coffeeshop last week with an ID that doesn't really look like him. Plus, it's all cracked and almost broken in half. He knows "his" date of birth, so I ask his Zodiac sign. Here's the rest of the conversation:

HIM: "I don't know"

ME: "You don't know your sign?"

HIM: "No. But I think October is Scorpio" (Damn, he's right, but WTF? In the meantime, I see a middle initial on the ID.)

ME: "What's your middle name?"

HIM: "I have no idea."

This is just getting laughable, but the picture looks enough like him that I give it one last ditch and say "Do you have ANYTHING else with your name on it? A credit card? A school ID? His wallet is totally empty.

At this point, I switch to English in total exasperation and say
"Are you seriously going to keep this up?"

I threw him out, much to his indignation, but I wondered, at what point would someone just give up and say, "OK, you got me. Bummer. I'm outta here." This kid hung on until the bitter end, acting like my coworker and I were the nutjobs.

Kids: Do better research. Old people were kids once too. And another thing: Old people don't like to be reminded that they're old, so stop "mevrouw"-ing me. I have my pride.