Fathers' Day (1997)

Synopsis
Two of the screen's most popular comic actors meet in this movie about two men brought together by unexpected circumstances. On the surface, Jack Lawrence (Billy Crystal) and Dale Putley (Robin Williams) wouldn't appear to have much in common. Jack is an efficient, serious-minded lawyer with a successful practice and a beautiful wife, Carrie (Julia-Louis Dreyfus). Dale is a very single performance artist given to dramatic mood swings and extreme overreaction to the sad state of his career. However, 17 years ago both men were involved with the same woman, Collette Andrews (Nastassja Kinski); she later had a son, Scott (Charlie Hofheimer), without being sure if Jack or Dale was actually the father. Collette chose to raise the boy on her own, but when Scott runs away from home and she can't track him down, she calls both Jack and Dale looking for help. It doesn't take long for the two men to discover that they're both looking for the same boy in the same places, and they decide to join forces, though their personalities don't get much more compatible the longer they hunt for Scott. Keep an eye peeled for a brief cameo by Mel Gibson and an appearance by the rock band Sugar Ray, shortly before their commercial breakthrough. ~ Mark Deming, All Movie Guide