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11. The Rocky Horror Picture Show
What was first a quirky, low-key musical, turned into one of the most beloved, cult-classic films of the century. The plot revolves around a newly engaged couple that have their car break down in the middle of nowhere, and they stop by the bizarre residence of Dr. Frank-N-Furter to get help. Many shenanigans and alien sightings ensue right after. 

While definitely zany, it's a parody tribute to the sci-fi and horror movies of the 1930s-1970s eras. People love it so much that we still have midnight viewings and sing-a-longs for the flick today.