The Philadelphia Experiment
(1984)
During World War II they conduct an experiment that is intended to make a destroyer invisible to radar. Stealthy, as we would say today. Something goes haywire, and two sailors end up in Nevada in the present day (1984). The best parts are their reactions to the things they see. Some of the special effects are pretty good for their time, but I kept getting the feeling they were missing the real meat of the story.