Good Table Manners (1951)

Chuck, a young loner, is invited by a neighbor to a dinner party, but turns it down. He finds himself visited by "Chuck of the future"--himself at age 21. "Chuck of the future" knows the reason the current Chuck doesn't want to go to the party--he's embarrassed over his poor table manners. "Chuck of the future" decides to give "Chuck of the present" some tips on proper table etiquette.