My Stepmother is an Alien (1988)

This so-called high-concept comedy is really something of a mixed bag as widower and mad scientist Dan Aykroyd falls for alien Kim Basinger who has come to earth to get him to save her planet.  At times it is mildly amusing as Basinger learns the meaning of such earthly pursuits as kissing and sex; at other times it is just downright stupid, especially when Jon Lovitz who plays Aykroyd's brother is involved.  To prove that not all child actors fall by the wayside, Aykroyd's daughter is ably played by Alyson (Band Camp) Hannigan in her film debut; also, if you look quickly, you can spot Juliette Lewis and Seth Green.  The bit that I remembered most from my previous view was the appeal of Jimmy Durante's song from "The Man who Came to Dinner" -- now that's a high concept comedy that works!