H. G. Wells wrote a story along those lines, but it wasn't that time was stopped but that time was extremely slowed. The main character was in a park was watching people more or less frozen. The observation was made that sometimes people's facial expressions look strange, funny, or even unsettling when they're frozen at a random point instead of part of a fluid gesture of body language -- particularly in the case of one guy who was in the middle of a wink. There was also some concern about not moving too quickly, or the friction with the air would burn him up. I don't remember much more of that story, but I'm curious now to go back and read it again. I don't even remember the title, unfortunately.