Haven't watched it lately (since high school in the 70's), but Pink Flamingos with Divine was unusual in the extreme.

Used to frequent the 99 cent Roxy theatre back then and see other unusual movies like Eraserhead, Fritz the Cat and Rocky Horror Picture Show. Well Rocky Horror seemed unusual when it was first released. I was amazed a couple years later when I got to university and it had become a mainstream cult favorite with all the toast, decks of cards and such flying through the air.