The Rocky Horror Picture Show
Budget: $1,200,000
Box office earnings: N/A – but it wasn't a lot.
There's probably no better example of a cult hit than this, but The Rocky Horror Picture Show had a... rocky start back in 1975 when it flopped during its first theatrical release. Since then, it's been running fan screenings pretty much continuously in cinemas longer than any other movie! Now, that's a legacy.
Scientific research shows that humans learn at the age of 18 month that not everybody likes the things and thinks like they do;
it also shows that people who call other eople stupid over a movie they like, are more likely to have a small penis, and live in their mums basement