I can't believe no one mentioned Raiders of the Lost Ark. But then, that's probably an ancient movie to some.... John Rhys-Davies was in it.
The Indiana Jones movies aren't that "ancient". That all depends on your point of view. I really loved all three movies and Rhys-Davies does quite a job with his character. He is more of a comical figure in those movies, offering a quirky line during more dangerous situations.
Don't forget he revived his character in "The Last Crusade"! One the funniest parts of the film is when he inadvertantly shoves Marcus into the Nazi truck. :)