Art the Clown is back! Or, is... in his first outing! Depends on where you put the previous Damien Leone shorts in horror movies the hierarchy, but Terrifier is a (blog post) full 90 sci-fi movies minute romp where Art the Clown does what Art the Clown does best. No, that is not explain his motives in the slightest.
Source: Terrifier Movie Review - Decker Shado