An easy going feelgood comedy from 1968, The Odd Couple was originally a Broadway show, and Frank Sinatra was one of the considerations for the film, but after seeing the movie, you can't imagine anyone else playing the roles that Walter Matthau (as Oscar Madison) and Jack Lemmon (as Felix Ungar) made their own (although Art Carney played Felix on Broadway). I know there was also TV series and a follow up film with Matthau and Lemmon reprising their roles, but for me, this is the definitive article, played superbly by Matthau and Lemmon, and with a great supporting cast (including John Fiedler from '12 Angry Men'), unlike the follow up, which stinks the place out Surstromming style.
Not much story to the movie though. Felix doesn't turn up for his regular game of cards with the boys at Oscar's house, and they learn that he may have been trying to kill himself as his marriage has broken up. He ends up staying at Oscar's, they get on each others nerves (mainly due to Felix, with his constant cleaning, cooking and aches and pains), but it all works out in the end.
Another American classic, if, like me, you like old movies.