Fire ants suck. I got shoved into an ant hill playing tag once, and just by counting the scars that are still on my arms five years later, I was bitten over 30 times on each arm.
My cat bites me regularly, and it's never a big deal.
Birds in general don't like me. I've known several people with pet birds that have shown me how they'll stand on you if you hold your finger out to them, and every time that I've tried this, I've been bitten.
I had a feeding accident with a very large (2 1/2 foot shell diameter) tortoise, but he was cool and let go of my finger as soon as he realized that it wasn't food.
I think the worst bite that I've ever had was from a pit mix that was after my cat. I got between them because he could have killed my cat, and got bitten once or twice on the ear. That bled like crazy, and tore a couple of earrings out, but I was fine.
I've only ever been bitten by one snake, which was a hatchling rat snake. He was going to get run over (ran over?), and he kept biting me as I moved him off the bike trail. It was adorable.