Fishing Spider Eating Frogs (National Geographic)
One variety has six or eight eyes and a moving retina with which it focuses on the prey. This clip shows one catch a frog, inject the venom, and liquefy the insides. Check this news item from BBC "Fish-eating spider invades Wales" from 2003. The headline is more exciting then the actual news.

Most spiders I deal with are not so interesting. I come across quite a few on the farm. I once discovered a big one sitting on my head while I was driving (no I didn't crash the car, it was flicked out through the window.)