I had a pet jumper in my first apartment. He would follow me and my wife from room to room, wave at us, and sit by the sink when he was thirsty. We gave him water and called him Steve.
The most interesting interaction I had was watching one hunt a fly. The fly landed, and it crawled down on the side of the board the fly was on, out of sight. It emerged behind the fly, then snuck up on it, similar to how a cat does (move, pause, move, pause). Then, when it attacked, it didn't jump at the fly, but jumped up in the air where the fly would be. It grabbed onto the flys back, then rotated, so the spider landed on its back, so the flys legs would be straight up, so it couldn't try to crawl away. It bit its neck area, waited a bit, then dragged it away. Really amazing, especially considering the fly was about the same size as the spider's body.