La fête des pères

Yeah, the plot's kinda lame and not too believable, but the stars are able to make it a fun time. In fact, the best moments are the ones that serve not to advance the story, but allow Williams and Crystal do their trademark acts.

Billy Crystal is a master of the non-response, such as when told that he has a 15 year old son, continuing to slowly drink his coffee. Robin Williams is the improv master. It's fun to guess which lines were written in the screenplay, and which ones just came from his head full of characters.

We know everything will turn out OK in the end, but there are enough unexpected twists and turns to keep the story interesting, and some pretty funny minor characters.