Butt Boy (2019)

That's right, Butt Boy.

After receiving a rectal examination, Chip, who looks just like a chubby Tom Green, quickly develops an obsession with sticking objects up his butt. He starts small, but the objects keep getting bigger. Soon he moves on to living things. Before long, kids are disappearing. A detective, who Chip happens to sponsor in AA, begins to suspect that the kids are disappearing up Chip's butt.

I don't want to give away what happens, but things just get crazier and crazier. But here's the kicker. It's played completely straight. And it is far better written and acted than you could ever expect from a movie with such an insane premise.