Prince, "Partyman" and "Trust" from "Batman"
"Partyman" and "Trust" are two Prince songs that are actually used in the movie, and they're used marvelously. "Partyman" accompanies a scene where the Joker, in one of the more bizarre and intangible plot threads of the movie, decides to assert himself as some kind of art world deconstructionist, going to a Gotham museum and garishly painting over priceless paintings and sculptures. The scene doesn't make a tremendous amount of sense, but at least with the Prince song, it has a certain amount of bounce (also the idea that one of the Joker's henchmen is being brought along simply to hold a boom box is sort of amazing). The second song, inspired by the Joker's line "Hubba-hubba-hubba-hubba, who do you trust?" plays over a sequence where the Joker rolls through town on a parade float, passing out money, while plotting to kill the citizens of Gotham with giant balloons filled with poison gas (no, this doesn't make much sense either). This song is not only a really great party jam and captures the frenzied mood of the sequence, but is a testament to Prince's rapid-fire genius -- the "Batman" album was made in six weeks, sometimes incorporating demos or previously recorded songs, modified to fit the super-heroic purposes.