In the 2008 movie Be Kind Rewind, Jack Black refilmed, or "sweded" popular movies on the cheap instead of buying them. People do this all the time for the fun of it, and the results are often wonderful because of the innovations necessary to get around the fact that you have no budget for the project. Here are some examples.
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Back to the Future

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Lord Of The Rings Trilogy

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Finding Nemo

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Star Wars

Only the final scecne of the first movie, but that one was quite effects-intense!
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Neverending Story

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Star Trek XI

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Jurassic Park

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Titanic

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Terminator 2

NSFW language, just like the movie.
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Captain America

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How To Swede

In case you'd like to try this yourself, here are some tips from Michel Gondry and the cast of Be Kind Rewind.