I vaguely remember this being an 80's zone episode. A man who is near death encounters a stranger sitting next to him. I think they were at a park. He presents a watch that not only is really accurate in recording time, but is also supposed to help humanity. The stranger is reluctant to take the watch, but the older gentleman eventually persuades him to do so. This stranger is now obligated to keep the watch on him at all times. Can anyone ID this episode and give me a better plot line for it? Thanks.