Coming back from Santi's school, I have to fight against him falling asleep in the car, so I ask him lots of things, try to maintain something faintly similar to a "conversation". Here's the exchange, brief and to the point, that we had just the other day.
P: "What did you eat Santi?"
S: "Oh, I don't know mommy."
P: "Who didn't go to school today?"
S: "Bruno."
P: "Did anyone go to the thinking chair?"
S: "Isabella."
P: "Why?"
S: "Mommy, please don't talk." And with that he folded his arms behind his head and started dozing off.