'The Celebration' (1998)
Your film geek relatives will recognize this Danish drama as the first movie to be made within the guidelines of Dogme 95, a filmmaker collective/movement that insisted on using real lighting, actual locales and no special effects in their projects. Everyone else will simply think of this as the movie with the most awkward family dinner ever, one which will make that Thanksgiving where your aunt farted at the table or your sister made that inappropriate O.J. Simpson joke seem like a Sunday brunch. During a large celebration for Dad's 60th birthday, the eldest son decides to make a speech in front of the assembled crowd — in which he accuses his father of molesting him and his late twin sister when they were kids. The title, by the way, is indeed ironic.