As an antidote to 15 Minutes, you could try Get Over It, a teenpic that's so innocent you keep expecting Mickey Rooney and Judy Garland to run up to the camera and shout, "Hey, kids, let's put on a show!" Set in a high school that must serve Wonder Bread for lunch every day, Get Over It stars Ben Foster as a guy who just got dropped by his girlfriend and Kirsten Dunst as his best friend's little sister, who isn't so little anymore. That's about it as far as social import goes, but director Tommy O'Haver (Billy's Hollywood Screen Kiss) and scriptwriter R. Lee Fleming Jr. (She's All That) have built the movie around the theater department's upcoming production of Midsummer Night's Dream--a contempo-pop musical version brought to a boil by the fiercely farcical commitment of Martin Short's drama teacher. The production numbers are a hoot, but my favorite moment is when Short, in high dudgeon, says, "Bill Shakespeare's a wonderful poet, but Burt Bacharach he ain't."