I have been bitten by numerous garter snakes. Also took a hit from my big 4.5-ft. BP when I tried re-adjusting one of the rats he was being fed. Got hit by my BCI awhile ago too, because I got too close to his head while changing his waterbowl.
None of them hurt much, except Goblin tried constricting around me, and luckily I jerked away reflexively.
More of a shock than anything else.