

In preparation for his daughter's wedding, dentist Sheldon Kornpett meets Vince Ricardo, the groom's father. Vince, a manic fellow who claims to be a government agent, then proceeds to drag Sheldon into a series of chases and misadventures from New York to Central America.
Acting
Falk and Arkin's volcanic chemistry—two masters at peak chaos
Writing
Andrew Bergman's debut script, every line a ticking absurdity bomb

Director
Arthur Hiller
Trivia, insights & behind the scenes
Falk and Arkin were so combustible that Hiller just let cameras roll on their improvisations, keeping only the most unhinged takes.
This basically invented the 'normal guy dragged into spy chaos' template that Midnight Run and every Shane Black film would later perfect.