I started playing for real (I only played the trial a few times during classic) during BC, specifically around the time Blizzard had that Olympic-based Battleground event going.
I could’ve done it, I stopped by the quest-giver several times throughout the event, but I never actually picked up the quests for the rewards because I assumed I had to be level 70 to actually take part. And then Blizzard went and never held the event again for some reason.
I’ll also add one for my brother: A few weeks before ZG was temporarily removed, he ran ZG with his girlfriend and had the Zulian Tiger drop. He gave it to her because she was a huge cats-lover. Halfway through MoP he found out she was cheating on him for two of the four-ish years they were together and dumped her. He has since moved on from the whole thing, but I think he’s still a little bitter about the Tiger, since he really wanted that mount back in the day.