Two Black Bags

Leo has a cake in a black bag. It is for his grandmother. Today she is ninety. Hana has a tuba in a black case. She has a concert. Both must be there at one o'clock. On the tram, they take the wrong bags! At half past twelve, Hana opens her case. A cake! Leo opens his bag. A tuba! They call each other. They run to the fountain and change bags. At one o'clock, both are in the right place.