We rarely see James Woods anymore, which is a shame because the guy has a near total command of both drama and comedy, as this opening scene attests. This The Exorcist parody has only the thinnest connection to the rest of the film, but that hardly matters with jokes this clever (yes, some of them are clever).
In short succession James Woods has had sex with, vomited upon, and shot the little possessed girl he's meant to save. And this is after his big diarrhea scene. It's awful. Brilliantly awful.