"The Hangover" is hardly the first movie to explore the aftermath of a very bad night. The genre could even have its own theme song -- Maureen McGovern singing "The Morning After" from "The Poseidon Adventure." Here are some other examples.

-- Wesley Morris and Mark Feeney, Globe Staff

From left: Zach Galifianakis, Bradley Cooper, and Ed Helms in the comedy "The Hangover."