I've been bitten more times than I can count... mostly from baby boas and whatnot, but I've had a few memorable BAD bites...
One of my "favorites" was 2 years ago. A "friend" of mine called me with a problem, his adult Macklot's python got loose in his car and managed to make his way into the dashboard. He brought his car over to my place, and we took the car apart to get the snake out. Once the snake was accessible I grabbed it and it was NOT very happy about that. He just started striking blindly and hit my arm about 6 times before I finally got a grip on his neck... Lesson learned: Do not grab angry adult macklot's python out of the car without a hook/gloves... oh well.
Another good one was back in 2004, I had a "good sized" (10ft) Retic. I was moving, so I had to bag her since it was fairly cold out at the time. She really was not in the mood to go in the bag, so she ended up grabbing my hand. As soon as she hit, she immediately wrapped my arm. She managed to get my hand in such a way that my thumb and first finger took the pretty much all of the teeth... one of them went right through my thumbnail and another hit the bone on my finger... (I still have the scars from THAT one...)
The other major memorable bite was when I was doing a demonstration for a group in 2005. (The bite happened afterwards, not DURING the demo). Anyway, I was showing them a variety of snakes and lizards that I had, and trying to teach them a bit about each. One of the animals that was included was my American Alligator. Granted he was only small at the time, maybe 3.5-4ft, but he has never really enjoyed having his mouth bound. I would generally only bind him if he was going to be out of his enclosure and around people other than myself. After the show, some of the children wanted to ask questions and see the animals closer, which was fine, but again... "Nigel (the gator)" was not in the mood. He was fine the entire show... but as soon as I got him home and unbound his mouth to release him into his enclosure, he quickly turned and snapped, hitting me in the face. At first it felt like he hit me with a closed mouth, so I thought nothing of it. Shortly after, i realized that his mouth was NOT closed, and that i had blood running down the side of my face and chin. I guess a few teeth got me.
Nowadays, my collection is pretty much Ball Pythons and a few species of Gecko... (a few boas also)... so I rarely if ever get bit by anything serious anymore. It's a bit less exciting, but I can't imagine that there won't be more stories in the future...