Felix in the Swim by Otto Messmer

5.70

A grateful mouse promises Felix "if there's anything I can do for you, just call on me" after Felix lets him go from a mousetrap. Felix then goes over to Willie Brown's house, whistles for the kid to come down from his bedroom and go "to the 'ole swimming hole" but Willie's mom spots him and tells the boy to go back inside and "practise his piano lessons."