The unintended target audience

Some movies are sometimes limited to viewing by certain demographics or type of audience due to their content, presentation, making etc.

However once in every blue moon, comes out a movie that crosses that threshold and becomes something crazy, unique and grows beyond what was intended.

Conclave felt like a major revelation in that aspect. What seemed like $5 discount Tuesday movie for 50+ year elders has attracted teens and young adults for its drama, inspiring a flood of memes and even going as far as being compared to Mean Girls. It has even grossed up to almosty $100 Million worldwide.

What are some other movies which resonated beyond their scope and size ?