Well, I live way out in the woods, and there are too many to really list in one post. I suppose all the many possums and coons I've run off of my cat's food dish don't really count, but here's a good one:
When I was 3 1/2 years old, we lived a little bit further back on the same land that we do now. We lived in a mobile home that my dad had added onto, and if it wasn't winter, the doors were usually open, as we only had AC in one room of the trailer. I think it would have been early spring at the time. My dad was at work, and somehow a water moccasin got inside, and made itself comfy on our kitchen counter, right next to the only telephone in the house. Now this moccasin was a good 6 feet long, probably six inches thick, and it was laying just as calm as could be right there on our kitchen counter. My older sister tried to get to the telephone, but the snake would threaten to strike if she got too close, so my other sister wound up having to ride her bike (with one flat tire if I recall correctly) down our half-mile-long, muddy from a recent rain driveway to my uncle's house to call 911.
So, after a goodly length of time, a black police officer showed up at the front door, came inside, took one look at that huge water moccasin and drew his pistol. Turned out they had sent the one guy on the force that was deathly scared of snakes. My mom, of course, told the guy that he wasn't going to shoot the snake in her house, and so he left. In the end, my uncle came down and killed it with a hatchet, if I remember correctly.
That day has always stood out in my mind, along with the time my older brother (I'm the baby of the family, the next oldest is 12 years up) went to pick up a tire laying out in the yard and there was a big ol' copperhead in it which promptly struck. He jumped three feet up and ten feet back from a total standstill, and the snake missed. Scared my brother half to death, though.
Edited to add: I was probably about 15 feet away from the water moccasin. I've been closer to them, and plenty of other snakes, since, but that one time just really stands out.