I was in the middle on a 4 or 5 day self supported trip. One of
these suckers was in the water and boarded my kayak. The brown snake sure made me start packing brownies of my own! It was about 2m long. I didn't know what type of snake it was when it happened. I looked up and found out later, and it sent a few tingles down my spine, considering we were in a gorge that you can't walk out of the gorge and we were a couple of days out, I would have been in some trouble!
Soon after that I was paddling again, and I'd just shot an easy grade 3 rapid. A 10foot+ red belly black snake jumped in the water after being freaked out by somebody else and started heading down the rapid. It was on one side of the river but heading toward the other. I didn't know where to go to get away from it. Luckily it got out half way down the rapid :o!!
One other time, we were on an easy grade 2 river with some beginners. We were going past some farms and some cattle got spooked by us and started to run. One accidentally ran straight over someone in the group, he wasn't hurt and it was quite funny.
Another time on the same river, we'd just paddled it in flood and were waiting on a small bridge for our driver. A bull decided to charge across the bridge at us (ok so we were kind of annoying it for a while to pass the time). My mate jumped off the bridge into the water. He didn't realise how fast the water was going and was pretty far down stream before he got out. Fun times