Must Watch:
Star Wars A New Hope
Raiders of the Lost Ark
Die Hard
Back to the Future
T2 Judgement Day
That 5th one was incredibly difficult to choose.
Don't Watch:
Armageddon
Jumanji
Ninja Scroll
X2 X-men United
Matrix Revolutions
Not really the worst movies in the world, but those are probably the least entertaining from the list.
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Black Turtle and Zelda always win!