See You Next Wednesday is a recurring gag in most of the films directed by John Landis, usually referring to a fictional film that is rarely seen and never in its entirety. Each instance of See You Next Wednesday in Landis's films seems to be a completely different film.
Landis got the title See You Next Wednesday from the 1968 movie, 2001: A Space Odyssey. It is the last line spoken by Frank Poole's father during Poole's videophone conversation with his parents.
References
See You Next Wednesday Wikipedia(Text) CC BY-SA