Imitative learning Puns

I learned this from an old girlfriend's dad when he did it to her little sister.

Dad: Puts his hand on top of kid's head and squeezes to imitate a rhythmic suction. Then he says "You know what this is?"

Kid: "No what?"

Dad: "It's a brain sucker, you know what it's doing?"

Kid: "Sucking my brain."

Dad: "Nope! It's starving!"

This one gets me every time!