"Zitra vstanu a oparim se cajem". Produced in Czechoslovakia, 1977. English title: "Tomorrow I wake up and scald myself with tea".
I realize that the idea of a Czech comedy from 1977 does not seem too attractive, but this movie is a criminally underrated masterpiece that deserves every bit of attention it can get.
The story: It is the future. Time travel (strictly for sightseeing purposes) has become commonplace. A group of Nazis are planning to hijack a time machine back to 1944, where (OK, when) they will present Adolf Hitler with a modern type of bomb which will help him win the war.
Unfortunately, the time machine's pilot (who was in on the plot) chokes to death on his breakfast, and his identical twin decides to take over his identity - and with it, his job. The twin thinks he's only supposed to do a routine trip, and causes the plan to go hilariously, spectacularily wrong.
However, the Nazis still have a time machine at their disposal. They return to the day before they left, and try to rectify their mistake. And this is where their problems START...
The movie should be available on eBay, complete with optional English subtitles!