I do cable TV and phone tech support. Our policy requires us to access the account when we help a customer. Something similar to the following happens at least once a week.
Customer explains problem.
Me: "Okay, I can help you fix that, but our system didn't pull up your account. Who am I speaking with?"
Customer: "I'm the son of the account holder."
Me: "OK, and what's your name?"
Customer: "David." *
Me: "Okay, and what's the name on the account?"
Me: "... and the full name on the account?"
Customer: "I should be on there."
Me: [gives up] "OK, and what's the address where you guys are?"
*name changed to protect the obtuse.**
** not really.