Grumpiest Old Men

Grumpiest Old Men was supposed to be the third installment in the Grumpy Old Men trilogy, with Jack Lemmon and Walter Matthau returning to their respective roles.

Plot
The film would've involved around Marcello Mastroianni (Maria's ex husband) who contests her marriage to Max on the grounds that their divorce wasn't finalized.

Why It Was Cancelled

 * It was cancelled due to the failures of Jack Lemmon and Walter Matthau's other films, Out To Sea, and The Odd Couple II

Results

 * The film is cancelled.
 * Grumpy Old Men ended up being a duology.