Arthur Lake -- unaccountably dressed in a kilt -- is a college student who has to stay in the dorm and study rather than go to a dance. Hah! He sneaks out to be with his best girl, whose little brother peppers him with a slingshot, giving Lake the chance to do some pratfalls.
I am always surprised at Lake's uniformity of performance from his early dances in the movies as a callow young comic, to the days when he played Dagwood Bumstead to Penny Singleton's Blondie; the only difference was his voice, which turned out to be perfect for his screen character.