Heck, I got you all beat.
I handle liability investigations for auto accidents as my day job and last month, I talked with a guy on the phone who'd been in an accident and he claimed to be
a former President of the United States!
He clearly wasn't all there because I was almost openly mocking his claim through the call and he didn't catch on.
For example, he said there were no witnesses to the accident he'd been in and I gasped in mock surprise and said, "Wait, your Secret Service detail didn't see it happen?" He changed the subject. The guy had to be nuts because he also claimed to be the Grandfather or at least 3 other former Presidents of the United States as well as the grandfather of the driver of the other car he'd hit (even though he couldn't tell me the name of that other driver).
I also once had someone claim to be a Medal of Honor awardee, a former USMC jet pilot who been awarded the Medal for taking a machine gun at Chosin. Of course, it was easy to confirm he'd never been awarded it. I was told by my boss
not to confront him about that when he came to the office (we rarely ever see people face to face), and I had to choke that one down, which of course didn't sit well with me at all.
Soon afterward, one of my coworkers came to me with a name and asked if that was the name of an astronaut. It didn’t sound familiar so I looked it up. He wasn’t. Turned out, this jerk was telling people in my office that
he walked on the moon! I am very glad I didn’t get that call because I would have called him out on it. Our management doesn’t take well with us telling people they’re full of it, even when they obviously are.