You may have heard of this already, as it's old news. Twenty-five years old, actually. In the 1980s, three teenagers made a shot-for-shot remake of Raiders of the Lost Ark. They started in 1982 at age 12 and finished in 1989 at age 19, working weekends and summers, and asking for props as Christmas presents. The dedication required blows my mind.
Here's the trailer, made for a screening in 2005:
Click to view
Here's a report from Talking Movies:
Click to view
Here's
a little photo gallery, and
some side-by-side shot comparisons, and
several interviews with the filmmakers. And now there's a
movie in the works to tell their story.