For me it's Master of Disguise (2002). I saw it when I was little and I didn't know what a good movie was. To me even as an adult Dana Carvey tries so hard and fails that I get some enjoyment out of it. There is some enjoyment in itself of watching a talented comedian desperately flail on the screen for something to land. Plus the plot is absurd. It only makes it worse because there are some genuinely talented actors in there like Harold Gould and Brent Spiner.