I can't remember how many times I scared my guild in Molten Core and BWL back then with that trick during prep time before bosses.
"Reike... what are you... Reike... get back here.... WTH MAN!? ... what the..."
As my character strolls right between the bosses feet.
I also used it to escape getting ganked by sending my fake off the cliff and watched as the alliance dived off after it. I felt that might be a bit abusive so I only did that once when I was seeing if alliance saw a fake me as well.
But this was a bug back in Vanilla, like a good little boy I submitted it, but it didn't get fixed till a few patches later.
I was a bit sad to see it go, it was like the party trick shamans could do at raids.
I swear, sometimes the flaws in games make them the most interesting.