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