This was our exchange this morning in the car on the way to school:
Son: "Papa, I want you to go fast."
Me: "We're already going pretty fast. Look, we just passed this car!"
Son: "No, I want to really go fast."
Me: "What do you mean?"
Son: "Push the 'fast' button."
The 'fast' button is apparently putting the transmission into DS by pushing the stick to the left.