Simply put, this is a Mel Gibson movie. And a comedy, at that. A somewhat 'dark' comedy, but it clearly is not meant to be taken seriously. His crooked character has been cheated out of $70,000 by another crook and he is determined to get it back. No matter what. The entertainment comes in the ways in which he repeatedly gets into impossible positions, and usually is able to get out of them. Good excitement and good writing. There are no good guys in this movie, just bad, badder, and baddest!
