In the last few years, I saw a trailer for a film where clowns are a separate species that are hunted by humans (or at least by the people shown in the film). I remember it largely being by guys in pickup trucks, carrying hunting rifles. For some reason, I remember one of them shooting from a ladder in the bed of the pickup truck. In other parts of the film, they're luring the clowns using things like cream pies and floppy shoes.
I think I saw the trailer on Youtube around the same time I saw the one for ClownTown, which was released in 2016, which suggests I may have seen the trailer around 2015, although the film may be older.