The Twilight Zone - Season 2 Episode 13 -

It's April 14, 1961. Peter Corrigan and friends are discussing time travel at their men's club, Corrigan suddenly becomes dizzy. When his head clears, he has somehow traveled back to April 14, 1865 - the date of Lincoln's assassination. Knowing what is about to happen, he tries to warn everyone at Ford's Theater before it's too late.