Going Green

Kai was in the car with me today as I got gas for the van. I told him that gas makes the car go just like food makes us go and that it's kind of like the car is eating gas. Kai started to laugh and said, "Car eats grass!?" He mis-heard what I said, but no matter how much I tried to enunciate "gas" he hung onto the "grass" thing and kept saying it..."Car eats GRASS!"