This is very shortly after I hit 70 with my three shamans. I get a random tell from a level 27 mage.
Randomguy: hey can u lvl my char
Me: What?
Randomguy: ur like da best player on wow
Me: I assure you I am not.
Randomguy: but ur awesome
I was sure it was one of my friends at first, since they've been known to do similar things, but they all swore it wasn't them.
Some of the other classics that I love is this one warrior that tanked some instances for me. He was already in my group and I invited a healer, who immediately goes "Shock1,2,3? WTF?" and the tank goes "Oh, he's bots. But he's cool." Which started a short conversation where the tank insisted that I was in fact botting and that blizzard would ban me for that. Even though he was cool with running instances with me.
And this last story wasn't a tell, but rather vent convo. At the time I was in the second most progressed raiding guild, and the first most progressed was doing a pug SSC. So I got all three of my guys in. The only real problem was that the other guild was a Chinese guild. Probably half of them spoke English well enough to be understood and to understand native english speakers but in vent they were speaking mostly Chinese. So all throughout the raid I would keep hearing "<something in Chinese> Shockone, Shocktwo, Shockthree? <more chinese>". I think they had people continually asking about me throughout the entire raid.