Inside a restaurant....
Zach: Mommy, come with me. I want to show you something...
Mommy: What is it, Zach?
Zach: You come. Follow me.
Mommy: Ok. Ok.
Standing right in front of a glass showcase, displaying an array of delicious cakes.....
Zach: I want this chocolate cake (while pointing at some on display)
Mommy: But we just had dinner. Next time la, ok?
Zach: No. I want this chocolate cake.
Chocolate cake arrived, served with a scoop of ice-cream
Daddy: Eat the ice-cream la.
Zach: Don't want.
Daddy: Why? It's nice.
Zach: Because I didnt order the ice-cream. I only ordered the cake.
Mommy couldnt stop laughing......
The logic is there.