The Last Supper. Perfect black comedy that reeled me in so far that I was cheering for the murderers! (And then horrified at myself for agreeing with The Conservative!)
I though of mentioning **The Producers ** (both the original and the musical remake) and South Park: Bigger, Longer, and Uncut but I have some question about whether they could be considered black comedies. I think they are but I could see some people arguing that the tone of these movies is too excessively broad and silly for black comedy.