Les Visiteurs (1993)
Starring Jean Reno.
One of the few French movies I like.
Must have been 10-15 years ago since I saw this movie and it's still as good as it was then.
Good acting, fast pace, fun situations,...
All the elements for a good comedy.
A medieval nobleman and his squire are accidentally transported to contemporary times by a senile sorcerer. He enlists the aid of his descendent to try to find a way to return home, all the while trying to cope with the cultural and technological changes distinguishing his time from ours.
Full movie's on Youtube with English subtitles.
http://www.youtube.com/watch?v=PYZmx4HIhCw