That was the third incident - I'll tell the other two.

The second one happened when I used to deliver pizza. I showed up at a guy's house, and right before I got out of the car, I had a very uncomfortable feeling that there was a snake right on the ground. There wasn't, but as soon as I got to the door, the guy said to me, "Man you should have been here five minutes ago. I just got home with my son, and there was a copperhead on the porch. He almost stepped on it and I had to kill it".

The very first incident occurred when I was a kid, maybe 6 or 7. My younger brother and I were playing with an empty kid's pool. I picked it up, and my brother yelled "snake!" and we both ran. I didn't see anything, but I remember being really scared. My dad came out and killed two copperheads that were under there.

I think that the first incident caused me to "learn" to sense snakes, or at least copperheads (they are the most common venomous snake here in Georgia). I believe that there is some sort of radiation or vibration that they give off which I became partially attuned to.