Meet my office mate

I share my home office with a jumping spider. Usually he just sticks to his part of the room or ceiling, minding his own business. Last week he appeared on my monitor and showed too much interest in chasing my cursor before jumping into my lap! Today he has been absolutely still next to me on the window ledge. I thought he must have died until I was really close and took this photo ... and then he pounced. Yikes!