THE BIGGEST TROLL EVER: (Quoted from WoWWiki)
"Good luck, and grats when you defeat him. And you don't want to see something like
This happen. Trust me, take 20 men into this fight, and be well prepared, or you will end up like countless other groups... being destroyed by the world's largest troll, who's very angry at you."
Okay, I know it's a guy, but being an NPC, apparently he can get bigger than we PCs can. I've tried stacking Winterfall Firewater, Elixir of Giant Growth and the Witch Doctor's buff on a Blood Elf before; While she did grew twice, I *think* there is a certain limit to how big a PC can be, since I didn't notice her size increasing with any significance (she DID grew, but only a tiiiny bit compared to the first 2 effect stacks) on the 3rd effect stack. But again, I might be not paying attention in that split second.
Sadly, my Desktop's system board is fried, and my hard drive (which contains the screenshots) are stuck in it.