Honorable Mentions:
Duck Soup (http://www.imdb.com/title/tt0023969/)
Little Shop of Horrors
1960 version with Jack Nicholson (http://www.imdb.com/title/tt0054033/)
1986 version with Rick Moranis, Steve Martin, Bill Murray, Christopher Guest, John Candy, James Belushi, etc. (http://www.imdb.com/title/tt0091419/fullcredits#cast)
The Rocky Horror Picture Show (http://www.imdb.com/title/tt0073629/)