"To be with another woman, that is French. To be caught, that is American."

-and the movie is?
The right answer is:
Dirty Rotten Scoundrels (1988)
Those who knew the right answer were:
• Ben Affleck:
"Dirty Rotten Scoundrels"
• Zelig:
"Myndin er Dirty Rotten Scoundrels"
• Jack Nicholson:
"The story of my life... Dirty Rotten Scoundrels"