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 (blog post) is a full 90 minute romp where Art the Clown does what Art the Clown does best. No, that is not (blog post) explain his motives in the slightest.
Source: Terrifier Movie Review - Decker Shado