This clip is odd for a couple of reasons: It's been colorized and the dialogue is in German! However, the important part--Alfalfa singing Let Me Call You Sweetheart--is in English. This is from the episode Hearts Are Thumps (1937) in which Alfalfa's buddies, angry that he has betrayed the principles of the He-Man Woman-Haters Club, sabotage his lunch with soap.