My Fellow Americans (1996) Jack Lemmon, James Garner, Dan Aykroyd
Ex-presidents Kramer (Jack Lemmon) and Douglas (James Garner) have hated each other for years. But when the current administration of President Haney (Dan Aykroyd) -- Kramer's former vice president -- tries blaming a string of kickbacks from a defense contractor on the two former presidents, they band together. With Haney's goons trying to kill them, they set out across the country to try and clear their reputations. In the process, they see a side of America they never knew before.
The Odd Couple (1968) Jack Lemmon, Walter Matthau, John Fiedler, Herb Edelman
When fussy Felix (Jack Lemmon) becomes suicidal over his impending divorce, he accepts an offer to move in with his best friend, messy Oscar (Walter Matthau). Felix drives Oscar crazy with his obsession over his soon-to-be ex. Oscar tries to get him out of his funk by arranging a double date with two wacky British neighbors, Cecily (Monica Evans) and Gwendolyn (Carole Shelley). When the plan backfires and Felix grows even more despondent, his friendship with Oscar is put to the test.