Opportunity Knocks is a Dana Carvey comedy, which is probably enough for anyone who knows who Dana Carvey is to decide whether to watch this movie or not. Carvey stars as a con-artist who gets in over his head -- and too attached to the people he's duping for his own good. Sometimes it funny, sometimes it drags. I laughed and enjoyed the movie, but it's not strong enough to have any staying power.