We all have one. When you open up the Player's Handbook and look for a race for your latest character and go to yourself "I really don't want to be a..."
Apparently for WotC, that race was the Gnome. Often overlooked and seen as the red headed step brother of the dwarf, I've overlooked them myself.
Folks seem to love or loath halflings.
I've never fully understood the half races and wether or not they can breed amongst themselves.
But for me, the last race I'd personally choose would be an elf. Something about them just makes me want to avoid them these days. Maybe it's the amount of fighter / magic-users and fighter /magic-user / thieves I'd see in my early days of gaming.
So, what classic demi-human race do you avoid playing?