This study suggests that people who watch videos of crimes (from security cameras and the like) will be more likely to think the accused are guilty if the video is played in slow motion.
“We demonstrate that slow motion replay can systematically increase judgments of intent because it gives viewers the false impression that the actor had more time to premeditate before acting. In legal proceedings, these judgments of intent can mean the difference between life and death. Thus, any benefits of video replay should be weighed against its potentially biasing effects.”
They collected data from lots of Turkers–maybe from you?