In the tabletop vein...I was 19, and playing a superhero character that had a VERY small level of fame as a rising singer.
GM brings in this Juggernaut ripoff character and I think, what the hell. My char flies up, and I have the GM roll to see if he recognizes me. There's like a 6% chance that he does.
He does. Not only does he, but he's a fan. (It was a very good roll...for me.)
I kinda derailed the entire evening's combat in one roll, it's the only time in my life I ever did. And it was fun watching the GM's brain absolutely shut down in shock.
My other fun story was a different GM: it was GURPS and I claimed my char had area knowledge. He was like, "How does she know the area?" I thought about it and said, "She knows where all the malls are." (This was back in 1991. Malls were still a thing.) He disbelieved.
I told him to start naming landmarks in the area. He would. I'd tell him how to get there because of what mall it was near and how to get to that mall and then, by extension, to said landmark. I'd only been driving for about six months or so, but my mom had loooooved to go to shop, so it was a thing I could do: navigate that entire area via mall. Before I even learned how to drive.
Thanks, Mom!