Please tell me a joke!

Three turtles came to a restaurant and ordered three pieces of cake. As soon as the food was brought to the table, they realized that they didn't even have any money.

The big turtle said: I am the oldest, so of course I don’t have to go back to withdraw money.

The middle turtle said: It is most appropriate to send the little turtle.

The little turtle said: I can go back and withdraw the money, but after I leave, none of you are allowed to touch my cake! The big turtle and the middle turtle agreed, and the little turtle left.

Because his belly was empty, the big and medium turtle quickly finished his share of the cake. However, the little turtle disappeared. On the third day, the big and medium turtles were really hungry, so they all said in unison: "Let's just eat the little turtle's share."

Just when they were about to eat, the voice of the little turtle came from next door: "If you dare to touch my cake, I will not go back to withdraw the money!"