What are some unique party theme ideas?

My friends and I like to have parties just for fun, no particular occasion. We had a Halloween party, a fancy party, and a space party. We are planning on having a LOST party, holiday party(where we dress up as different holidays), and a zombie apocalypse party. I looked on google and I can't find any other... show more My friends and I like to have parties just for fun, no particular occasion. We had a Halloween party, a fancy party, and a space party. We are planning on having a LOST party, holiday party(where we dress up as different holidays), and a zombie apocalypse party. I looked on google and I can't find any other ideas besides western, hawaiian, 80s, etc...none of which interests us. If you have any different, cool ideas for party themes that aren't "popular" please let me know.
Update: We are all in 18-20 years old.
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