Ok, several:
At nationals last year, there was this very large dude with a pokewalker on a naruto headband. We sat next to each other at the 8 man right before me and my team left. I say he sat next to me, but the seats were so close together he pretty much sat on me. I know he couldn't have NOT felt me under there, it was just so awkward, I didn't want to tell him to get off of me.
At BR's last season, I built a deck centered around fossils. At the time, it was the best thing I had ever created. I even thought that I would win. (Armaldo FTW) I was so confident that I teched in a 2-2 Ursaring Prime in the parking lot. I lost miserably, only winning against a kid my friends called Chris Chan. I still have no idea why, but I gather that he had some sort of mental thing, because he narrated everything as if it were a TV show, and he played very random stuff. Good thing I topdecked that Ursaring.
At Tulsa Cities this year, I traded this one kid a Blaziken FB Lvl. X for a Gengar Prime. He said, "If I want to play Gengar, I'll just play CurseGar." If you don't get it, then I'm sorry, let me direct you to the state of the game forum. http://www.pokebeach.com/forums/showthread.php?tid=92126