We had a docile boy (ordinary hamster) who was lovely and would just potter about and let anyone play with him. He only bit 1 person and that was because she had baked bean sauce on her finger and he thought it would be good to taste. Our second hamster was a vicious little female, so pretty though, but the only way we could get her out of the cage was by careful negotiation with the exercise ball at the door of the cage. She even bared her teeth at a vet who stepped back in alarm!!
I got bitten by one of our rabbits like that. I walked past him eating strawberries, and he jumped up to get one from my hand. He missed the strawberry and got a mouthful of my thumb instead. I'm not sure which one of us was more shocked! At least I am now up to date on my tetanus jabs...
(Yes, our house is like a zoo!)
That's a point, actually, and my hamster book doesn't say anything about it: if I get bitten and it draws blood, should I get my tetanus updated?